Hi, Dr A. :) I'm an electronics graduate, i come here at lunchtime to refresh my memories, go through the basics one more time (again, and again). I must say I'm enjoying your videos and i'm glad there are still some people teaching the basics correctly (without mystification and misunderstanding of concepts). Also, i think the "glass" concept is very effective. Thanks from Belgium ;) z0
Jordan, Glad to hear it. I've been doing this for some time and I still find it challenging to explain some concepts, but I appreciate the feedback. Cheers, Dr. A
As an electrician I understand the Principles & Concepts of your lectures and also a bunch of well worn formulas that I use in my day to day work but I am fascinated by your very clear mathematical explanations of the theory and the way you illustrate with everyday examples. I don't think I have had Maths presented in such a compelling way. I really enjoy your lectures. Makes me feel like doing a maths degree.
Can't imagine skipping lessons because the explanation is so clear, as well as I didn't at my education in the Netherlands. You can of course become ill, but you can recover and follow again the lessons. Hopefully Dr. M. Anderson you don't become ill because some like your lessons just like me.
At 1:10 into the presentation, I am reminded (for no reason that I can think of nor describe) The change-over from a coil and points and distributor to a spark plug which has a gap with electricity coming from a battery with a generator recharging the batteries or an alternator which must have its current converted to 12 volts from alternator current. At any rate, I had a BMW Motor cycle, and R80, which had some sort of distributor with points. I sent away for a capacitive discharge ignition. Directions helped me to figure out where the wires should go. And I recall perhaps that a plate went into the distributor to replace the points, but maybe not; it was quite a while ago, the 1970's. I'm guessing that it is possible that some of these effects were at work, in this system. I know that the Capacitive discharge ignition timed a release of current differently than the purely with the points opening and closing the circuit. The other thing I recalled is that during the process, there was an increase going on in the capacitive discharge unit until a certain quantity of volts or amps was reached (in storage) and then a sudden higher velocity current (than points and coil alone) was released through the spark plug wires to the spark plug. I also recall that a proper propagation of the spark needed to occur, while combining the compression of the air/fuel mixture, so that the spark started the explosion within the motorcycle's cylinder at a moment when it could ignite the mixture in a controlled fashion. I recall also that the octane of the air/fuel mixture was important because it had to do with the willingness of the mixture to ignite more or less completely in a, "controlled," fashion with even spark spread. This all had also to do with the compression ration and something called the Stoichometric ratio of air to fuel with an ideal being measured theoretically at sea level I recall that timing was either before or after top dead center, when the piston had compressed the air fuel mixture (which itself was sent into the cylinder by a carburetor of a fuel injector. Some times long or short runners are used and sometimes it is a gravity feed or a fuel rail etc. The idea was to have the fuel entering the cylinder in an exact amount at exactly the right time. (Port injection and direct injection being two of the way to present or introduce fuel into the cylinders.) Whether a carburetor which has jets, or injectors of some variety, the aim was to take that same Stoichometeric 14.7 parts air to one part fuel and to break the mixture up so the molecules of air and fuel were not only together, but while doing so, the small possible size of droplets, evenly spaced within the confines of the cylinder were achieved. This also helped with the control of the burn or explosion (controlled explosion); at the same time, the finer the particles of the mixture could be made as they were dropped, pushed, pullled or forced into the confines of the cylinder would mean a more complete burn of the entire air/fuel mixture in the cylinder. I recall that compression had a lot to do with the tight seal of the rings of the piston against the walls of the cylinder, cutting off escape of the A/F mixture during the compression stroke from a relative small approximtely circular area of the seal; while at the same time, the A/F mixture intake valve would come open at a timed moment in the cycle to admit the fuel. Further, the exhaust valve would come open theoretically just before, during or after the explosion in the cylinder to allow remaining unburned charge along with gases from the burned or exploded charge, to exit from the cylinder. The piston going up and down in the cylinder would compress or squish the fuel as it rose; and then it would tend to create a vacuum while dropping and creating a larger volume in the down stroke. However the tremendous force of the explosion, burn and gases also were pushing against the piston which then pushed the rod to which it was attached which pushed on a journal of the crank shaft, forcing it to rotate in one plane but with offset positions by 1 to 16 cylinders in automotive engine (except Wankel engines). In reality, the efficiency of an engine is measured again all of the above with the valves having what is known as, "overlap." This mean that during the ,"ignition stroke,", both the intake and the exhaust valves were both open or a period of time, a percentage of the entire four stroke process, at the same time. This brings back the discussion of the CDI or Capacitive Discharge ignition. It was found that just having a hotter spark did not automatically mean more power in the engine and each of its cylinders. That spark had to be of a certain temperature to ignite the perfectly mixed & atomized A/F mixture properly to allow the flame generated by the spark to spread evenly and minimize hot and cool spots within the cylinder. The stronger and more sudden spark caused or allowed for with the CDI, however, allowed the gap of the spark plug to be widened, while the spark jumped across the gap with the same intensity as had previously been performed with a closed circuit via the points and ignition in the distributor. Because the gap was then widened, it was thought that additional surface area would give a better and larger start to the ignition process and thus burn more A/F mixture during the same stroke. Also these CDI's could be slightly better timed in terms of exactly when the spark was released. Efforts were made to control all of the above. Compression of the fuel; its mixture qualities; and the ability of the spark to propagate properly all changed as the revolutions per minute climbed up the tachometer range, or the useful range of RPM's within the cylinder as the car ran and the engine performed. Through computer controlled experiments in which values of valve overlap; degrees before or after top dead center where ignition occurs (timed over the length of the four-stroke process); design of intake and exhaust ports and the length of fuel rails, runners, etc. (has to do with cooling or chilling the A/F mixture and to some degree the so-called, "ram-air effect" of the charge even in naturally aspirated engines because of the characteristics of, "vacuum," within the intake runners and the exhaust manifolds (headers), cats, and exhaust pipes, mufflers and pipe exits to the outside environment of the air. Further controls were sought with the change of elevation where the engine was functioning, based upon changing elevations during hill and/or mountain driving. (This is because the greater the elevation, the, "thinner the air" becomes; that is the molecules of oxygen per volume become reduced. This pretty much concludes what this talk on coils and magnetism and induction and step-up and step-down coils and even the importance of lambda is all about. It is important to note that I don't understand 99% of what Matt Anderson presents and despite my discussion of the above, I don't really understand how to actually work with an internal combustion engine. Also, I barely hinted at pipe length on intake and exhaust and temperature controls of both A&F and the working engine. I also did not mention the two main manipulations of N.A. engines (Naturally Aspirated), that being forced induction. The two prime methods of forced induction are supercharging and turbo charging. A, "blower," or turbine unit or fan of some kind is used to force more air and fuel into the combustion chamber or cylinder: that is Supercharging and the air comes from outside the engine. Theoretically therefore the temperature of the charge is regulated more or less by the ambient air temperature in which the vehicle operates plus any heat generated by the running of the engine that heats the A/F mixture. Turbo charging takes spent gases that come out under quite a degree of heat from the combustion chamber during the exhaust stroke and gases and route some of these which are under pressure, back into the intake to force at a higher velocity a new charge into the combustion chamber during the compression stroke. One last note that I recall. In any intake and exhaust movements of air and fuel within the restricted spaces of the intake and exhaust systems, something known as exhaust tuning also occurs. The same thing that astronomers and all forms of scientists have been studying for years about waves of sunlight and radio waves, also apply in the intake and exhaust systems. Control of the waves include both constructive and destructive waves and secondary waves that occur during the processes described previously. The lengths of runners and exhaust systems and their tuning, including types of bends and their number all have impact on efficiency of the internal combustion engine. Efficiency has improved over the history of the I.C.E. because of the development of precisely timed computer controlled ignitions; variable valve timing and exhaust flow. After all of that, the power generated at the crankshaft in the ICE, must be transmitted to the rear wheels and that has also been developed over time. But certainly a good percentage of the generated power to the crankshaft is lost during the transmission of power to the rear wheels. Matt Anderson can tell you a whole lot more about all of that, than I can. But this review has been fun and cathartic. AF
Excellent teaching technique and superior knowledge = easy to follow and understand. Thanks for making these lectures available. I learned a lot watching them. All teachers should teach like you.
John, Really appreciate it. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
+Steve Saboe Steve, thanks for the comment. And sorry about electrician school. Hopefully you'll find some teachers you can connect with. Cheers, Dr. A
Wow! surprised to see that he drives approximated number and confirms it... never expected that level of details... Professor, you show us how to use our brain... Thanks a lot!!!
.as a retired aerospace engineer at my 73 very much interested in electromagnetism I learn a lot from.your well-represented lectures on the subject..thank you very much..I am very much interested in magnetic hysteria also..I hope you are planning lectures on this branch of magnetism.. thanks again..
I like numbers theory and once you have a 10. Well that’s Farraday and Maxwell. I admire electricians and their engineers. I am not either. A clear working model of the basics can educate in more than one way, and differently for different persons. I am impressed. Thankyou
Ohh at clip 57:37 we can take the derivative on both sides of the equation because the number of turns and mutual inductance are both constants so we need not worry about it so it makes the math easier.
After watching other videos and another professor wrote to me saying that the EM Waves doesn't carry energy (per Classic Model) then I thought about this: *I have the desire to learn, I don't have the ability* (I can for the longest time imagine (3d shapes and daydreaming) in my mind, but formulas and algebra wasn't my destined ability) I prefer the long content, over the shorts. Thanks for sharing the videos. 5:50 B.A.(Cos) - I would have to run a Map function (programming) - 0*-90* degrees = 0-100%
Dr. A, greetings to you I Mst. Meet Gadekar from Indian Institute of Technology Bombay (IIT Bombay) I really appreciate your videos Sir they've been helping me in my major's. I'm as impressed by your wonderful teaching skills as by your mirror writing. Great lecture keep it up Sir!
Why is nobody talking about the fact that this guy is drawing in perspective and writing backwards, Flawlessly, on a piece of glass in front of him. So it looks normal to the people in front of the glass, and the camera..... That's crazy
Which university are you teaching sir? I love your video so much, in fact in my life, I have never had the luck of having such a teacher or a professor with that amazing teaching like you. I did have an excellent professor in Social Economic Class but not any of physics and mathematics. My TA in University actually were my teachers, but not professors. Our professors in Toronto Canada usually delivered some lectures that had nothing to do with homework, and most of the time, we did not understand. Basically, they just throw a textbook at us and let us figure it out on our own in the university, and whether or not we failed or passed it was up to us. In high schools, teachers are working so hard to teach high school students, but most of the time, they chat over our voices, being rude, and had no appreciation. And we are high schools or elementary schools teachers are blamed for the by-products of our societies. I think teaching students know how to respect and appreciate teachers must come from the cultural framework and from a small child, not wait until they became adults, then it is too late.
When the plug was pulled from the socket, it wasn't the current change that caused the spark … it was the high voltage that caused the spark. A typical toaster uses 5 amp at 120 volts. Given that E = Ldi/dt, when the plug is pulled, dt is less than 1ms. Depending on the wire resistance and the coil inductance L, the current decays at a much slower rate. Therefore, E is equal to L x 5a / .001s. The voltage can easily be great than 5000 volts at the plug … that's the spark.
Hi Matt, I hope you have thought of a system where you can just quickly and easily wipe-off the writing from the glass with MUCH less force! Final breakthrough! THANKS FOR ALL THE GRAET VIDEOS!! Excuse the misspelled word.
Decided to check out your other vid. I can no longer wear battery operated watch. Long story but I did something that made me magnetic to brass colored Xmas bells. After that "accident" could only wear wind-up watches. Any thoughts?
Carmen, No idea. I think that one is for a medical doctor instead. Thanks for the comment, and keep away from the bells! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Friends? Anyways great videos I like when you go slightly off tangent and explain real world phenomena. I really liked your explanation of super conductors on your first electric circuits video.
5.0-- He assigns Theta to the OBTUSE angle subtended by the 'plate' to Horizontal ? To solve using COSINE requires ACUTE angle subtended by the 'plate' to VERTICAL being (Theta- 90) Therefore 'plate angled/area presented to Horizontal'= 'plate area x COS(Theta-90) BETTER alternative would be to solve using SINE - assign Theta to the ACUTE angle subtended by the 'plate' to Horizontal Thereby, 'plate angled/area presented to Horizontal'= 'plate area' x SINE.Theta Trig seems tricky till we nail it, right guys ?
Great as usual Dr.Anderson! I have a question and I hope you answer.. You said that coils or inductors dont like the change in flux or the magnetic field, because that's nature! Or maybe its linked to energy conservation! But, what does really happen inside!? Whats the practical perspective of this!? The second question, how did we know that phi=M.I, or in other words how did we know that the generated flux is linear with the current causing it? Thanks!!
M Ibrahim, Thanks for the comment, not sure I have the bandwidth to answer this right now. But come visit our new website: www.universityphysics.education Cheers, Dr. A
Sir i have a question... in the toy train transformer problem you said the voltage has linear relationship with current but that’s only the case when resistance is same but ...in this case resistance should be different as the resistance is directly proportional to the length of the conductor which is different in primary and secondary coil ...so my question is why the resistance factor is considered same for both coils ??
Man, I wish I had a teacher like you when I was young. Thank you for these video! Truly remarkable! I love you for them in the deepest, most professional and non homo way possible, thanks!
Bich, Excellent catch! But I fix it at 21:30. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Birara, Not sure I fully understand your question, but note that negative signs generally indicate direction. So the negative sign in Faraday's Law indicates the direction that the current will take. But it's easier to use Lenz's Law to determine this direction. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
It's because of the way we define θ which is with respect to the surface normal (perpendicular vector pointing out of the surface). Thus cosθ gives us the amount of field "crossing" the surface, whereas sinθ would give us the field parallel to the surface. For flux we are interested in how many field lines cross the surface, thus we use cosθ. Good question. Cheers, Dr. A
RANGARAO D V, The vector direction of an area is always perpendicular to the surface. The choice of UP of DOWN is somewhat arbitrary. You can choose either as long as you are consistent. Great comment, thanks. You might also like my new website: www.universityphysics.education Cheers, Dr. A
Hello Professor! For the solenoid at 1:01:35 shouldn't the B field of the solenoid point downwards as the current through the solenoid also flows downwards? or is there something I'm missing? Thanks!
Q: ) Why Is There Something Rather Than Nothing? A: ) Because Magnetism is an attractive force, not a repulsive force ? That's a guess, gravity is also an attractive force. Isaac Asimov in a book thought it was because there were more protons than electrons in the universe ( thus forming matter )
OMG! At 50:28 he flouts Ohm's law claiming V or EMF being positive despite admitting that I is zero due to infinite R. But zero I * Infinite R = zero EMF since mutiplying ANYTHING by zero = zero. Just check the plastic hoop by a voltmeter. Will the secondary coil of a transformer develop a voltage if made up of non conducting plastic? Nevertheless the rest of the lecture is very good.
Eric, Got a bit swamped with other endeavors, but we'll get back to making new videos soon. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
@@yoprofmatt Definitely understandable. Of course and I plan on it once I find out what exactly is going on with my school and how classes will be handled in the fall hopefully I will get back in the swing of things. I should probably let you know I am not a physics major just an enthusiast. I really enjoy mathematics and physics. I will check out your website most definitely. Thank you for your time Professor Anderson.
Sarvam Electromagnetism Editor: Karthik Foreword: • What is electromagnetism? • Is the atom and the universe electromagnetic? • Are the planets electromagnetic? • What are the electromagnetic properties? • Is the food are the electromagnetic? • Is Shiva also electromagnetic? • Does evolution also apply to electromagnetism? • What is the connection between meditation and yoga and electromagnetism? • What is the relationship between siddha and electromagnetism? • How did the Siddhas excel in all the arts? • Does electromagnetic theory work in the arts? • Are planets responsible for climate change and change? • Is light an electromagnetic wave? • Is our body electromagnetic? • What is the connection between disease and electromagnetic theory? • Is electromagnetic theory responsible for natural disasters? • Are there links to astrophysics and electromagnetic theories? The purpose of this study is to explain why everything is electromagnetic. Accordingly, we have heard of electromagnetism. Accordingly, we get an electromagnet when it takes a nail and passes it around the copper coil with the initial terminal of the copper coil and the opposite end of the copper coil. Thus the electromagnetic properties of the electromagnetic materials are emitted as waves of mixing. The electronic devices we use, microwave ovens, cell phones, etc., are based on this. But how many of us know that we and the other living things around us are basically working on these electromagnetic properties? Planets and electromagnetism: Planets are also becoming magnetic. Navagrahas is a Sanskrit word meaning nine rulers. As we have seen earlier, any object that revolves around positive and negative electric energy turns into an electromagnet. Likewise, all the atoms in this phenomenon are rotating. Thus, when rotating, light is circulating on one side and darkness on one side. Thus, every cosmic atom is electromagnetic. Therefore, it is the force of gravity in every object. Thus the planets, which are magnetic atoms, are exposed to the energy around them, including electromagnetic fields, electromagnetic waves, and electromagnetic radiation. In doing so, the electromagnetic properties of the eigenvalues, with their characteristic capacitance and pulling properties, are modified. This causes natural changes, rages, and disasters to occur. Our body is also electromagnetic, so our body, due to these electromagnetic properties, experiences growth, change, and disease. Everything we see, dress, eat, wear and use is every kind of electromagnetic illusion. Therefore, every second is experiencing various physical and mental advances and troubles in our lives. Astrology is predicting this. Changing nearby objects will change the result. This is Vastu, & witchcraft. This science has been used by our ancestors in art and spirituality. Climate Change: The above-mentioned seasonal changes occur only after a certain amount of electromagnetic radiation of a flower's flowering, preserving and bearing fruit has been matched to the fivefold composition of the material. Likewise, electromagnetism causes every life and every atom to change from birth to death. Light & Electromagnetic Radiation: According to today's science, electromagnetic radiation is the light. Accordingly, light is of two types: emitted light and reflected light. The photoelectric effect can be cited as an example. Photosynthesis: Likewise, the received light contains the ores of the light source (asteroids and galaxies). Plants can combine such light to store those minerals as herbs and foods. Medical and Electromagnetic Theory: When our body is deficient in immunity, the disease is caused by a deficiency of minerals in the body. Therefore, when the disease occurs, any minerals in the body are given to us as a drug, whether it is a drug or a chemical. Atomic and Electromagnetic Waves: Practical science says that the nature of matter changes depending on how many orbits in an atom are present. According to practical science, the presence of electrons in the atom is the result of the control of the electrons in a substance, whether it is in solid, liquid, or gas state. The properties of cosmos.
+Ayna Ayna, thanks for the comment. Turns out this particular lecture is one of the more difficult to teach this way, since it requires a few modifications, including the "Right" Hand Rule becoming my Left Hand. Had to try this a few times before we got it right. Cheers, Dr. A
Question here professor: Lenz's law section, the right-hand rule uses thumb to the direction of B field, and four fingers hold the current, but in another of your video "Magnetism". i saw thumb is to the direction of the current, and fingers hold the B field. Why are they different
I wonder, If I measure the voltage between any two poins in the wearing loop where the current floows that is produced by the field. What voltage I will measure?
L S, Depends on the resistance according to Ohm's Law. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
The Inductor converts part of the electric current called (I)=Q/t to magnetic flux (BA) . The magnetic field (B) itself is not energy. Energy (E) is a PRODUCT of the current (Q/t) and magnetic flux (BA). Thus E = 1/2 Q/t * BA or 1/2 (I )* BA. So B is just one factor of the energy equation. It is wrong to imply that B is energy or contains energy. Surprisingly B boils down dimensionally to 1/t or the reciprocal of time. The stronger the B the shorter the time interval and greater the velocity, acceleration, voltage and energy where time is the denominator. Furthermore since E = 1/2 current * BA then for a GIVEN amount of E, when B or BA is increasing current or Q/t will be decreasing and if BA is decreaing then current must increase. L is just BA/I (in Ohm Sec) so E - L* I^2 = the old BA* (I). Point is the inverse relationship between BA and (I) for a fixed E does not require manufacturing te negative feed back of Lenz. because when E is fixed BA and (I) are MATHEMATICALLY inversely related. Analogous to F=ma.. Afterall there is no Lenz for F = ma is there?
Hello Professor, Thank you very much for the video. I was confused as to why when the magnetic field was increasing, the induced magnetic field was in the same direction as the applied field. I thought nature abhores the change in flux so shouldn't it face the opposite direction when increasing and the same direction when it is decreasing? Thank you.
Joe Varghese, Can you give me a time stamp for where you're confused. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
mohanreddy tetala, Working on it. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
"Why" is a difficult question for scientists to answer. Why does a changing flux induce a current? Because Faraday's Law and Maxwell's equations tell us so. But I suspect this is an unsatisfactory answer. At some point we just say "okay, this is how nature is, let's see if we can model it." Cheers, Dr. A
@@yoprofmatt Perhaps there is an explanation based on Faraday's own ideas. Because he was troubled by the notion of action at a distance, Faraday suggested the idea that there was a "field" which arises together with the time-varying magnetic field in the region occupied by the energised system. Maxwell took up the idea but tried to explain this by proposing a field of interacting vortices in the luminiferous aether. We understand from our ideas in electrostatics that the only force which can cause a charge to move from a state of rest is an electric field. Magnetic fields can of course cause charged particles to change direction but only if the particle is actually moving relative to the magnetic field. The conclusion typically drawn in physics literature is that the time-varying magnetic field causes a mutually induced electric field which acts along the closed loop path - and this causes a current to flow whilst the magnetic field continues to change with time. Other physics texts argue that the time-varying magnetic field is not the "cause" of the mutually induced electric field. Rather it is argued that both the primary induced magnetic field and the mutually induced electric field are effects of one and the same cause - the time varying current in the primary winding. This latter idea has some credibility, since the time-varying magnetic field strength near the closed secondary loop could be negligible - such as the case where the magnetic flux is confined to a highly permeable magnetic circuit. Negligible magnetic flux cuts the secondary loop conductor but current still flows in the secondary loop.
I would never feel bored of physics if learning from your lectures.
Thanks!, now I sleep at school and learn at home from your video's
Bring a pillow.
Cheers,
Dr. A
Me too
Xx
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Professor Matt - Thank you! My TPS report grade has drastically improved since I discovered your channel!
Hi, Dr A. :) I'm an electronics graduate, i come here at lunchtime to refresh my memories, go through the basics one more time (again, and again). I must say I'm enjoying your videos and i'm glad there are still some people teaching the basics correctly (without mystification and misunderstanding of concepts). Also, i think the "glass" concept is very effective. Thanks from Belgium ;)
z0
Clear explanation and good sense of humour. I'm not solennoyed anymore! Many thanks.
T B,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
Excellent video, you're an extremely clear and thorough Physicist and I'm very grateful for your explanations
Jordan,
Glad to hear it. I've been doing this for some time and I still find it challenging to explain some concepts, but I appreciate the feedback.
Cheers,
Dr. A
I also am appreciative of the physicists. Amazing !
Holy moly, he made it so easy to visualize by using GOOD DRAWINGS while explaining. I wish my professor is like him.
As an electrician I understand the Principles & Concepts of your lectures and also a bunch of well worn formulas that I use in my day to day work but I am fascinated by your very clear mathematical explanations of the theory and the way you illustrate with everyday examples. I don't think I have had Maths presented in such a compelling way. I really enjoy your lectures. Makes me feel like doing a maths degree.
Ian Heams,
Thanks you made my day.
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
Wow. I'm as impressed by your wonderful teaching skills as by your mirror writing. Great lecture. Thanks!
He writes normally and a mirror image is presented. It's a teaching tool sometimes advertised on this channel.
@@aculasabacca Oh! Okay! I was marveling at his skills, too! Lol
Can't imagine skipping lessons because the explanation is so clear, as well as I didn't at my education in the Netherlands.
You can of course become ill, but you can recover and follow again the lessons.
Hopefully Dr. M. Anderson you don't become ill because some like your lessons just like me.
Thank you, free lectures like these is the main reason I left my University. 10 years later and I'm still enrolled in youtube college.
At 1:10 into the presentation, I am reminded (for no reason that I can think of nor describe) The change-over from a coil and points and distributor to a spark plug which has a gap with electricity coming from a battery with a generator recharging the batteries or an alternator which must have its current converted to 12 volts from alternator current. At any rate, I had a BMW Motor cycle, and R80, which had some sort of distributor with points. I sent away for a capacitive discharge ignition. Directions helped me to figure out where the wires should go. And I recall perhaps that a plate went into the distributor to replace the points, but maybe not; it was quite a while ago, the 1970's. I'm guessing that it is possible that some of these effects were at work, in this system. I know that the Capacitive discharge ignition timed a release of current differently than the purely with the points opening and closing the circuit. The other thing I recalled is that during the process, there was an increase going on in the capacitive discharge unit until a certain quantity of volts or amps was reached (in storage) and then a sudden higher velocity current (than points and coil alone) was released through the spark plug wires to the spark plug. I also recall that a proper propagation of the spark needed to occur, while combining the compression of the air/fuel mixture, so that the spark started the explosion within the motorcycle's cylinder at a moment when it could ignite the mixture in a controlled fashion. I recall also that the octane of the air/fuel mixture was important because it had to do with the willingness of the mixture to ignite more or less completely in a, "controlled," fashion with even spark spread. This all had also to do with the compression ration and something called the Stoichometric ratio of air to fuel with an ideal being measured theoretically at sea level I recall that timing was either before or after top dead center, when the piston had compressed the air fuel mixture (which itself was sent into the cylinder by a carburetor of a fuel injector. Some times long or short runners are used and sometimes it is a gravity feed or a fuel rail etc. The idea was to have the fuel entering the cylinder in an exact amount at exactly the right time. (Port injection and direct injection being two of the way to present or introduce fuel into the cylinders.) Whether a carburetor which has jets, or injectors of some variety, the aim was to take that same Stoichometeric 14.7 parts air to one part fuel and to break the mixture up so the molecules of air and fuel were not only together, but while doing so, the small possible size of droplets, evenly spaced within the confines of the cylinder were achieved. This also helped with the control of the burn or explosion (controlled explosion); at the same time, the finer the particles of the mixture could be made as they were dropped, pushed, pullled or forced into the confines of the cylinder would mean a more complete burn of the entire air/fuel mixture in the cylinder.
I recall that compression had a lot to do with the tight seal of the rings of the piston against the walls of the cylinder, cutting off escape of the A/F mixture during the compression stroke from a relative small approximtely circular area of the seal; while at the same time, the A/F mixture intake valve would come open at a timed moment in the cycle to admit the fuel. Further, the exhaust valve would come open theoretically just before, during or after the explosion in the cylinder to allow remaining unburned charge along with gases from the burned or exploded charge, to exit from the cylinder. The piston going up and down in the cylinder would compress or squish the fuel as it rose; and then it would tend to create a vacuum while dropping and creating a larger volume in the down stroke. However the tremendous force of the explosion, burn and gases also were pushing against the piston which then pushed the rod to which it was attached which pushed on a journal of the crank shaft, forcing it to rotate in one plane but with offset positions by 1 to 16 cylinders in automotive engine (except Wankel engines). In reality, the efficiency of an engine is measured again all of the above with the valves having what is known as, "overlap." This mean that during the ,"ignition stroke,", both the intake and the exhaust valves were both open or a period of time, a percentage of the entire four stroke process, at the same time. This brings back the discussion of the CDI or Capacitive Discharge ignition. It was found that just having a hotter spark did not automatically mean more power in the engine and each of its cylinders. That spark had to be of a certain temperature to ignite the perfectly mixed & atomized A/F mixture properly to allow the flame generated by the spark to spread evenly and minimize hot and cool spots within the cylinder. The stronger and more sudden spark caused or allowed for with the CDI, however, allowed the gap of the spark plug to be widened, while the spark jumped across the gap with the same intensity as had previously been performed with a closed circuit via the points and ignition in the distributor. Because the gap was then widened, it was thought that additional surface area would give a better and larger start to the ignition process and thus burn more A/F mixture during the same stroke. Also these CDI's could be slightly better timed in terms of exactly when the spark was released.
Efforts were made to control all of the above. Compression of the fuel; its mixture qualities; and the ability of the spark to propagate properly all changed as the revolutions per minute climbed up the tachometer range, or the useful range of RPM's within the cylinder as the car ran and the engine performed. Through computer controlled experiments in which values of valve overlap; degrees before or after top dead center where ignition occurs (timed over the length of the four-stroke process); design of intake and exhaust ports and the length of fuel rails, runners, etc. (has to do with cooling or chilling the A/F mixture and to some degree the so-called, "ram-air effect" of the charge even in naturally aspirated engines because of the characteristics of, "vacuum," within the intake runners and the exhaust manifolds (headers), cats, and exhaust pipes, mufflers and pipe exits to the outside environment of the air. Further controls were sought with the change of elevation where the engine was functioning, based upon changing elevations during hill and/or mountain driving. (This is because the greater the elevation, the, "thinner the air" becomes; that is the molecules of oxygen per volume become reduced. This pretty much concludes what this talk on coils and magnetism and induction and step-up and step-down coils and even the importance of lambda is all about. It is important to note that I don't understand 99% of what Matt Anderson presents and despite my discussion of the above, I don't really understand how to actually work with an internal combustion engine. Also, I barely hinted at pipe length on intake and exhaust and temperature controls of both A&F and the working engine. I also did not mention the two main manipulations of N.A. engines (Naturally Aspirated), that being forced induction. The two prime methods of forced induction are supercharging and turbo charging. A, "blower," or turbine unit or fan of some kind is used to force more air and fuel into the combustion chamber or cylinder: that is Supercharging and the air comes from outside the engine. Theoretically therefore the temperature of the charge is regulated more or less by the ambient air temperature in which the vehicle operates plus any heat generated by the running of the engine that heats the A/F mixture. Turbo charging takes spent gases that come out under quite a degree of heat from the combustion chamber during the exhaust stroke and gases and route some of these which are under pressure, back into the intake to force at a higher velocity a new charge into the combustion chamber during the compression stroke.
One last note that I recall. In any intake and exhaust movements of air and fuel within the restricted spaces of the intake and exhaust systems, something known as exhaust tuning also occurs. The same thing that astronomers and all forms of scientists have been studying for years about waves of sunlight and radio waves, also apply in the intake and exhaust systems. Control of the waves include both constructive and destructive waves and secondary waves that occur during the processes described previously. The lengths of runners and exhaust systems and their tuning, including types of bends and their number all have impact on efficiency of the internal combustion engine. Efficiency has improved over the history of the I.C.E. because of the development of precisely timed computer controlled ignitions; variable valve timing and exhaust flow. After all of that, the power generated at the crankshaft in the ICE, must be transmitted to the rear wheels and that has also been developed over time. But certainly a good percentage of the generated power to the crankshaft is lost during the transmission of power to the rear wheels. Matt Anderson can tell you a whole lot more about all of that, than I can. But this review has been fun and cathartic. AF
My one and only physics mentor. Thanks for all your classes and the learning glass concept.
Excellent teaching technique and superior knowledge = easy to follow and understand. Thanks for making these lectures available. I learned a lot watching them. All teachers should teach like you.
John,
Really appreciate it.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
Thanks man! You're such a better teacher then the 6 teachers I have for electrician school
+Steve Saboe Steve, thanks for the comment. And sorry about electrician school. Hopefully you'll find some teachers you can connect with.
Cheers, Dr. A
Electrician school? They only deal with the Lumped sum elements; this is way beyond the guy who is installing wires into your home.
Thank you very much!professor Anderson God bless you and your family. You helped me a lot
Dr.Anderson I wish you were my physics mentor back then in 90s
The teacher was very good at watching, really good teaching in these exercises, without asking him would be better than me watching this tutorial.
Cheers,
Dr. A
Dr. Anderson you have made my weekend going good. Thank you.
Easyfacts,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
Flawless work, professor. Keep up the amazing work, recommended your videos/style to my professor (nationally renowned)
+Danoroxursox13
Thanks very much for the positivity. I'm working on getting more videos loaded.
Cheers, Dr. A
I found your lecture in Pearson's e-book. Now, I finally can understand Physic
Office Space is one of my all time favorites.
I really love this professor. Thank you sir!
Bich Ngoc,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
Wow! surprised to see that he drives approximated number and confirms it... never expected that level of details... Professor, you show us how to use our brain... Thanks a lot!!!
.as a retired aerospace engineer at my 73 very much interested in electromagnetism I learn a lot from.your well-represented lectures on the subject..thank you very much..I am very much interested in magnetic hysteria also..I hope you are planning lectures on this branch of magnetism.. thanks again..
Hasan Ekerol,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
I like numbers theory and once you have a 10. Well that’s Farraday and Maxwell. I admire electricians and their engineers. I am not either. A clear working model of the basics can educate in more than one way, and differently for different persons. I am impressed. Thankyou
Ohh at clip 57:37 we can take the derivative on both sides of the equation because the number of turns and mutual inductance are both constants so we need not worry about it so it makes the math easier.
Awesome.
Cheers,
Dr. A
After watching other videos and another professor wrote to me saying that the EM Waves doesn't carry energy (per Classic Model) then I thought about this: *I have the desire to learn, I don't have the ability* (I can for the longest time imagine (3d shapes and daydreaming) in my mind, but formulas and algebra wasn't my destined ability)
I prefer the long content, over the shorts. Thanks for sharing the videos.
5:50 B.A.(Cos) - I would have to run a Map function (programming) - 0*-90* degrees = 0-100%
Dr. A, greetings to you
I Mst. Meet Gadekar from Indian Institute of Technology Bombay (IIT Bombay)
I really appreciate your videos Sir they've been helping me in my major's.
I'm as impressed by your wonderful teaching skills as by your mirror writing. Great lecture
keep it up Sir!
So nice of you. It is definitely my pleasure. And hello to another Fanderson in India.
Cheers,
Dr. A
Pretty good so far (35:47). Describes Lenz coventionally instead of saying that B flux like momentum is a conserved quantity.
I really love your lectures, that I take notes while watching them, the concepts, the applications etc ! Thank you, Professor.
5v
X
Xxxx
X
Xx
Can I tell you that I love you man? This video is emotional
Why is nobody talking about the fact that this guy is drawing in perspective and writing backwards, Flawlessly, on a piece of glass in front of him. So it looks normal to the people in front of the glass, and the camera..... That's crazy
sir u r god of physics for me .....
Thank you so much! You are an amazing professor! Keep the videos coming :)
+David Fernandez Thanks David, doing my best to produce new videos. Cheers, Dr. A
Great video!! Really helpful sir
Please continue making such videos
I'm working on it.
Cheers, Dr. A
I will never understand how this man wrote backwards for 90 minutes
You are bloody brilliant Dr A!
Bloody for sure. Don't know about brilliant.
Cheers,
Dr. A
Call me crazy but I just binge watch his content for fun😭😭
They're so interesting
At first I thought this was the start of a really bad stand up comedy routine, then my mind was blown.
Which university are you teaching sir? I love your video so much, in fact in my life, I have never had the luck of having such a teacher or a professor with that amazing teaching like you. I did have an excellent professor in Social Economic Class but not any of physics and mathematics. My TA in University actually were my teachers, but not professors. Our professors in Toronto Canada usually delivered some lectures that had nothing to do with homework, and most of the time, we did not understand. Basically, they just throw a textbook at us and let us figure it out on our own in the university, and whether or not we failed or passed it was up to us. In high schools, teachers are working so hard to teach high school students, but most of the time, they chat over our voices, being rude, and had no appreciation. And we are high schools or elementary schools teachers are blamed for the by-products of our societies. I think teaching students know how to respect and appreciate teachers must come from the cultural framework and from a small child, not wait until they became adults, then it is too late.
He is in Texas as far as I know.
i am a grade 10 student and after this i am better than my teacher
+Samar Aboulenain
Thanks Samar, good luck in college.
Cheers, Dr. A
When the plug was pulled from the socket, it wasn't the current change that caused the spark … it was the high voltage that caused the spark. A typical toaster uses 5 amp at 120 volts. Given that E = Ldi/dt, when the plug is pulled, dt is less than 1ms. Depending on the wire resistance and the coil inductance L, the current decays at a much slower rate. Therefore, E is equal to L x 5a / .001s. The voltage can easily be great than 5000 volts at the plug … that's the spark.
It was really helpful. Cheers from Germany!
My cat goes nuts when your marker squeaks, I think he things there are mice!
Hi Matt, I hope you have thought of a system where you can just quickly and easily wipe-off the writing from the glass with MUCH less force! Final breakthrough!
THANKS FOR ALL THE GRAET VIDEOS!! Excuse the misspelled word.
Decided to check out your other vid. I can no longer wear battery operated watch. Long story but I did something that made me magnetic to brass colored Xmas bells. After that "accident" could only wear wind-up watches. Any thoughts?
Carmen,
No idea. I think that one is for a medical doctor instead.
Thanks for the comment, and keep away from the bells!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
this man is saving my life rn.
1:05:50 is this the process of ionizing air?
Friends? Anyways great videos I like when you go slightly off tangent and explain real world phenomena. I really liked your explanation of super conductors on your first electric circuits video.
Would you need a 3-D mapping device to explain flux ? And flux was a conduit for melted tin and lead, what other flux are you talking about?
What is that slapping sound in the background I hear throughout the lecture?
5.0-- He assigns Theta to the OBTUSE angle subtended by the 'plate' to Horizontal ?
To solve using COSINE requires ACUTE angle subtended by the 'plate' to VERTICAL
being (Theta- 90)
Therefore 'plate angled/area presented to Horizontal'= 'plate area x COS(Theta-90)
BETTER alternative would be to solve using SINE -
assign Theta to the ACUTE angle subtended by the 'plate' to Horizontal
Thereby, 'plate angled/area presented to Horizontal'= 'plate area' x SINE.Theta
Trig seems tricky till we nail it, right guys ?
Thank you sir. :) this is really helpful.
Great as usual Dr.Anderson!
I have a question and I hope you answer..
You said that coils or inductors dont like the change in flux or the magnetic field, because that's nature! Or maybe its linked to energy conservation! But, what does really happen inside!? Whats the practical perspective of this!?
The second question, how did we know that phi=M.I, or in other words how did we know that the generated flux is linear with the current causing it?
Thanks!!
M Ibrahim,
Thanks for the comment, not sure I have the bandwidth to answer this right now. But come visit our new website: www.universityphysics.education
Cheers,
Dr. A
@@yoprofmatt okay :(
I have the website already bookmarked doctor ⚘
Sir i have a question...
in the toy train transformer problem you said the voltage has linear relationship with current but that’s only the case when resistance is same but ...in this case resistance should be different as the resistance is directly proportional to the length of the conductor which is different in primary and secondary coil ...so my question is why the resistance factor is considered same for both coils ??
Man, I wish I had a teacher like you when I was young. Thank you for these video! Truly remarkable! I love you for them in the deepest, most professional and non homo way possible, thanks!
I got a bit confused. At 18:49 we have theta = 90 and theta 1 = 45 but at 20:47 we have (cos 45 - cos 0)? Can anyone explain it to me? Thank you.
Bich,
Excellent catch! But I fix it at 21:30.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
I wish I had a physics teacher like you at my school.
ว้าวๆๆ หึๆๆๆ ยังงี้ต้องลองดูสิแล้วครับจารย์ หึๆๆๆ
You are extremely clear ... to the topic😍😀
I don't know why the charge on magnetic flux is negative in faraday's law if you know why please
Birara,
Not sure I fully understand your question, but note that negative signs generally indicate direction. So the negative sign in Faraday's Law indicates the direction that the current will take. But it's easier to use Lenz's Law to determine this direction.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
Thanks professor
@@yoprofmattThanks!,
Hi Matt! small doubt, when we calculate flux of an angled object we used Flux = B*A Cosine, question is why did we use only cosine? why not sine.
It's because of the way we define θ which is with respect to the surface normal (perpendicular vector pointing out of the surface). Thus cosθ gives us the amount of field "crossing" the surface, whereas sinθ would give us the field parallel to the surface. For flux we are interested in how many field lines cross the surface, thus we use cosθ.
Good question.
Cheers,
Dr. A
Thank you so much! Dr. A, am enjoying physics
How you decide when to use FRHR ,FLHR and RHR
sir my doubt is for the areal vector given at 10:17 , how would we determine if its about the plane or below it?
RANGARAO D V,
The vector direction of an area is always perpendicular to the surface. The choice of UP of DOWN is somewhat arbitrary. You can choose either as long as you are consistent.
Great comment, thanks.
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
Hello Professor! For the solenoid at 1:01:35 shouldn't the B field of the solenoid point downwards as the current through the solenoid also flows downwards? or is there something I'm missing? Thanks!
You had me at Office Space.
+Hanumanbearpig
Excellent. Don't remember if I quoted it or not, but excellent movie.
Cheers, Dr. A
I want to ask you about the transformer Emf. With a telescopic antenna, would the tip be the same shape as the voltage pattern from the transformer ?
No idea. You need to speak to an electrical engineering professor with a specialty in antenna design.
Cheers,
Dr. A
Q: ) Why Is There Something Rather Than Nothing?
A: ) Because Magnetism is an attractive force, not a repulsive force ?
That's a guess, gravity is also an attractive force.
Isaac Asimov in a book thought it was because there were more protons than electrons in the universe ( thus forming matter )
Cheers,
Dr. A
Thankyou for this amazing session!!! Love from India ❤️
Ananya Gaur,
You're very welcome. Glad you're enjoying the videos.
You might also like my new site: www.universityphysics.education
Cheers,
Dr. A
@@yoprofmatt I most definitely will☺️
I also have discovered that C equals circumference not the speed of light in the famous energy formula.
Hi Professor! How are you writting on that board? It´s a kind of magic? Nice job
Iñaki Salido Pulido,
The board is called Learning Glass. You can check it out at www.learning.glass
Cheers,
Dr. A
@@yoprofmatt Thank you very much!
Mr Anderson , can you do a video on primitivity and permeability? I can't understand the difference between them!😑
OMG! At 50:28 he flouts Ohm's law claiming V or EMF being positive despite admitting that I is zero due to infinite R. But zero I * Infinite R = zero EMF since mutiplying ANYTHING by zero = zero. Just check the plastic hoop by a voltmeter. Will the secondary coil of a transformer develop a voltage if made up of non conducting plastic? Nevertheless the rest of the lecture is very good.
Matt Anderson why have you stopped making videos? You're an amazing teacher. These videos are incredible.
Eric,
Got a bit swamped with other endeavors, but we'll get back to making new videos soon.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
@@yoprofmatt Definitely understandable. Of course and I plan on it once I find out what exactly is going on with my school and how classes will be handled in the fall hopefully I will get back in the swing of things. I should probably let you know I am not a physics major just an enthusiast. I really enjoy mathematics and physics. I will check out your website most definitely. Thank you for your time Professor Anderson.
Sarvam Electromagnetism Editor: Karthik
Foreword:
• What is electromagnetism?
• Is the atom and the universe electromagnetic?
• Are the planets electromagnetic?
• What are the electromagnetic properties?
• Is the food are the electromagnetic?
• Is Shiva also electromagnetic?
• Does evolution also apply to electromagnetism?
• What is the connection between meditation and yoga and electromagnetism?
• What is the relationship between siddha and electromagnetism?
• How did the Siddhas excel in all the arts?
• Does electromagnetic theory work in the arts?
• Are planets responsible for climate change and change?
• Is light an electromagnetic wave?
• Is our body electromagnetic?
• What is the connection between disease and electromagnetic theory?
• Is electromagnetic theory responsible for natural disasters?
• Are there links to astrophysics and electromagnetic theories?
The purpose of this study is to explain why everything is electromagnetic.
Accordingly, we have heard of electromagnetism. Accordingly, we get an electromagnet when it takes a nail and passes it around the copper coil with the initial terminal of the copper coil and the opposite end of the copper coil. Thus the electromagnetic properties of the electromagnetic materials are emitted as waves of mixing.
The electronic devices we use, microwave ovens, cell phones, etc., are based on this.
But how many of us know that we and the other living things around us are basically working on these electromagnetic properties?
Planets and electromagnetism:
Planets are also becoming magnetic. Navagrahas is a Sanskrit word meaning nine rulers.
As we have seen earlier, any object that revolves around positive and negative electric energy turns into an electromagnet.
Likewise, all the atoms in this phenomenon are rotating. Thus, when rotating, light is circulating on one side and darkness on one side. Thus, every cosmic atom is electromagnetic. Therefore, it is the force of gravity in every object.
Thus the planets, which are magnetic atoms, are exposed to the energy around them, including electromagnetic fields, electromagnetic waves, and electromagnetic radiation.
In doing so, the electromagnetic properties of the eigenvalues, with their characteristic capacitance and pulling properties, are modified. This causes natural changes, rages, and disasters to occur.
Our body is also electromagnetic, so our body, due to these electromagnetic properties, experiences growth, change, and disease.
Everything we see, dress, eat, wear and use is every kind of electromagnetic illusion. Therefore, every second is experiencing various physical and mental advances and troubles in our lives. Astrology is predicting this.
Changing nearby objects will change the result. This is Vastu, & witchcraft.
This science has been used by our ancestors in art and spirituality.
Climate Change:
The above-mentioned seasonal changes occur only after a certain amount of electromagnetic radiation of a flower's flowering, preserving and bearing fruit has been matched to the fivefold composition of the material.
Likewise, electromagnetism causes every life and every atom to change from birth to death.
Light & Electromagnetic Radiation:
According to today's science, electromagnetic radiation is the light. Accordingly, light is of two types: emitted light and reflected light. The photoelectric effect can be cited as an example.
Photosynthesis:
Likewise, the received light contains the ores of the light source (asteroids and galaxies). Plants can combine such light to store those minerals as herbs and foods.
Medical and Electromagnetic Theory:
When our body is deficient in immunity, the disease is caused by a deficiency of minerals in the body. Therefore, when the disease occurs, any minerals in the body are given to us as a drug, whether it is a drug or a chemical.
Atomic and Electromagnetic Waves:
Practical science says that the nature of matter changes depending on how many orbits in an atom are present. According to practical science, the presence of electrons in the atom is the result of the control of the electrons in a substance, whether it is in solid, liquid, or gas state. The properties of cosmos.
I'm glad to understand physics, thanks. But really, how am I to use this formula to make a paddle wheel like on the old Mississippi river ?
No idea, but sounds like fun.
Cheers,
Dr. A
Can you add automatic subtitle to the videos because I'm not native English speaker.
BTW if I is zero in the plastic loop due to infinite R then Ohm's Law says V= IR = zero * Infinity = ZERO. No?
but shouldnt there be a current due to the conductor moving through the B field as electrons inside it are moving with it and should feel a force
Ohh I have a question the 1/2 for the energy in the inductor comes from kinetic energy formula??
Great question. At 1:08:52 I allude to the fact that you really need to do an integral, and when you integrate you pick up the 1/2
Cheers,
Dr. A
Convention center? Are you in San Diego?
it's not your left side and not your right side. Mirroring is amazing idea for video, like that. I appriciate that!
+Ayna
Ayna, thanks for the comment. Turns out this particular lecture is one of the more difficult to teach this way, since it requires a few modifications, including the "Right" Hand Rule becoming my Left Hand. Had to try this a few times before we got it right.
Cheers,
Dr. A
for which grade this course is designated to
Question here professor: Lenz's law section, the right-hand rule uses thumb to the direction of B field, and four fingers hold the current, but in another of your video "Magnetism". i saw thumb is to the direction of the current, and fingers hold the B field. Why are they different
I was waiting for some mention that the transformer only works on AC and the behavior of inductors is very different for AC vs DC.
I wonder, If I measure the voltage between any two poins in the wearing loop where the current floows that is produced by the field. What voltage I will measure?
L S,
Depends on the resistance according to Ohm's Law.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
@@yoprofmatt For instance I have 2 different resistors in this loop installed in series. What resisnance I will measure?
AC Current. AC stands for alternating current, so the current after the AC is redundant. You may say AC circuit though.
The Inductor converts part of the electric current called (I)=Q/t to magnetic flux (BA) . The magnetic field (B) itself is not energy. Energy (E) is a PRODUCT of the current (Q/t) and magnetic flux (BA). Thus E = 1/2 Q/t * BA or 1/2 (I )* BA. So B is just one factor of the energy equation. It is wrong to imply that B is energy or contains energy. Surprisingly B boils down dimensionally to 1/t or the reciprocal of time. The stronger the B the shorter the time interval and greater the velocity, acceleration, voltage and energy where time is the denominator.
Furthermore since E = 1/2 current * BA then for a GIVEN amount of E, when B or BA is increasing current or Q/t will be decreasing and if BA is decreaing then current must increase. L is just BA/I (in Ohm Sec) so E - L* I^2 = the old BA* (I). Point is the inverse relationship between BA and (I) for a fixed E does not require manufacturing te negative feed back of Lenz. because when E is fixed BA and (I) are MATHEMATICALLY inversely related. Analogous to F=ma.. Afterall there is no Lenz for F = ma is there?
Cleared up so many things
Hello Professor, Thank you very much for the video.
I was confused as to why when the magnetic field was increasing, the induced magnetic field was in the same direction as the applied field. I thought nature abhores the change in flux so shouldn't it face the opposite direction when increasing and the same direction when it is decreasing? Thank you.
Joe Varghese,
Can you give me a time stamp for where you're confused.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
@@yoprofmatt 30:35
What if you used your left hand?
Great question. You would get something in the exact opposite direction.
Cheers,
Dr. A
Is it really hard to get killed by 120V electricity? I doubt it.
where is he writing tho? what the setup callef?
nice we want see more videos of u sir
mohanreddy tetala,
Working on it.
Thanks for the comment, and keep up with the physics!
You might also like my new website: www.universityphysics.education
Cheers,
Dr. A
Hello Professor! Where can i get this kind of transparent board? Is it necessary some kind of software.? I'm from Brazil and loved your classes.
Ronaldo Ronaldo,
The board is called Learning Glass. You can check it out at www.learning.glass
Cheers,
Dr. A
Great class. Great video. On a side note do you know who you remind me of? Evan taylor thats who. He can definitely play you in some future film.
As in August Rush? Awesome.
Cheers,
Dr. A
@@yoprofmatt It looks like I used his name in that movie, silly me. I meant Freddie Highmore. Saludos.
Thank you for your videos, they are really really really good!
But why? when you change the flux through the loop, why does that induce a current in the loop?
"Why" is a difficult question for scientists to answer. Why does a changing flux induce a current? Because Faraday's Law and Maxwell's equations tell us so. But I suspect this is an unsatisfactory answer. At some point we just say "okay, this is how nature is, let's see if we can model it."
Cheers,
Dr. A
@@yoprofmatt I asked a similar question , why does matter curve space-time? Similar answer. Thanks!
@@yoprofmatt
Perhaps there is an explanation based on Faraday's own ideas. Because he was troubled by the notion of action at a distance, Faraday suggested the idea that there was a "field" which arises together with the time-varying magnetic field in the region occupied by the energised system. Maxwell took up the idea but tried to explain this by proposing a field of interacting vortices in the luminiferous aether.
We understand from our ideas in electrostatics that the only force which can cause a charge to move from a state of rest is an electric field. Magnetic fields can of course cause charged particles to change direction but only if the particle is actually moving relative to the magnetic field.
The conclusion typically drawn in physics literature is that the time-varying magnetic field causes a mutually induced electric field which acts along the closed loop path - and this causes a current to flow whilst the magnetic field continues to change with time. Other physics texts argue that the time-varying magnetic field is not the "cause" of the mutually induced electric field. Rather it is argued that both the primary induced magnetic field and the mutually induced electric field are effects of one and the same cause - the time varying current in the primary winding. This latter idea has some credibility, since the time-varying magnetic field strength near the closed secondary loop could be negligible - such as the case where the magnetic flux is confined to a highly permeable magnetic circuit. Negligible magnetic flux cuts the secondary loop conductor but current still flows in the secondary loop.
thank you professor