Full 1 Hour Video AC Circuits: www.patreon.com/MathScienceTutor Direct Link to The Full Video: bit.ly/3vEFYjI Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html Final Exams and Video Playlists: www.video-tutor.net/
Dude, you're a genius. I planned to skip these questions in my upcoming FE exams but then I decided to watch your video and lo and behold, you've made it so easy. and even explained what's not in the question. Thank you.
If not because of JG video, I don't know where I'll be today. Always teach from scratch until someone understand it. I always had A in school anytime I consult JG videos. You are not better than the rest but Best among the best.
Please, I need solution to these questions. I will be very glad if any of them can be solved or if there is any video you've made that you can refer me to. Thanks ASSIGNMENTS 1. A constant voltage of 150V is suddenly applied to a circuit of resistance 2Ω and inductance 10H. After 5s, the voltage is suddenly increased to 200V. Determine the value of the current after a time t=10.5s. Sketch the approximate shape of the current/time graph. 2. A series RL circuit with R=50Ω and L=10H has a constant voltage V=100V applied at t=0 by the closing of a switch. Find (a) The equation for I, VR and VL (b) The current at i=0.5s (c) The time at which VR=VL 3. A 200µF capacitor is to be connected to a 15V supply via a resistor. The capacitor voltage is approximately 63% of maximum 780ms after switch-on. Select a suitable resistor value and calculate the approximate time for the capacitor to become fully charged. 4. The circuit in fig.Q4 has reached steady state at t=0-. If the make-before-break switch moves to position b at t=0, calculate it for t>0. 5. A series RLC with R=200Ω, L=0.1H, C=100µF has a constant voltage V=200V applied at t-=0. Find the current assuming the capacitor has no initial charge. 6. A series RLC circuit with R=5Ω, L=0.1H, C=500µF has a sinusoidal voltage V=100sin(250t+ɸ)V applied at a time when ɸ=00. Find the current. 7a. Explain the following terms in relation to a transient circuit (i) Time constant in R-C circuit (ii) Transient response (b) In a parallel RLC circuit, R=50Ω, L=0.5H, C=12.5µF. Derive the expressions for the inductor current when i=100mA. Calculate the current after 2ms
@@FS-me8mj Sal tries to get you to understand the concept and ideas behind everything, but often ends up overcomplicating and deviating, and JG just tells you what you need to do to pass exams ... so depends on how you prefer.
Problem at 4:30--the current cannot decrease exponentially as stated when the switch is opened because open switch = open circuit = zero current, leading one to conclude that current decreases to zero instantaneously. In practice, as current decreases at a very high rate when switch is opened, di/dt is very high, energy stored in coil's magnetic field is discharged into circuit at a very high rate, a very high voltage is developed in the coil opposing the drop in current, that voltage opposes the battery voltage and is many times higher, and the air between the opening switch contacts is ionized, allowing a spark of current to flow in the direction opposite to the original current to dissipate the power supplied by the inductor. You have here the basis of the battery-powered automotive ignition circuit.
Exam in exactly 24 hours, I’d say I’m on the lower end of procrastination compared to some here, but I had to spend the last 5 days Nodal, Mesh, Linearity, Max Power, Thevenin’s, Norton’s, Source Transformation, Op-Amps, Capacitors, RC Circuits (still working on getting that down) because I took this entire semester for granted aaaand now I’m here. Wish me luck lmao
Another great set of examples helping us to understand the intricacies of these calculations. I don't yet understand how capacitors and inductors differ in their purposes for a single circuit. When do you use one or the other for a single circuit and why?
@"The Organic Chemistry Tutor" - Can you possibly explain me one thing that I find hard to understand. Lets say we have an inducting coil, but it is make of a super-conductor. We fill that super-conducting coil with current and store energy in magnetic field that is created. We unplug the coil from the current source and current flows forever, because there is no resistance. Now comes the difficult part I don't understand: since now energy is stored in a magnetic field, and stored energy is a state of higher potential, wouldn't be normal to expect magnetic field to want to collapse back to zero and in process coil current will fade away to zero, as well? Essentially, never mind that resistance in super-conductor is zero, the magnetic field would want to collapse, regardless of what resistance is, because it's on a higher potential?
Late reply but better late than never. You use .174A because it's asking you to find values like voltage at that moment, 8 ms. So in that moment, the current would be .174 A.
For #1, we used the I equation which represents current increasing, the 1-e one, but we got a +EMF which tells us that the current in this circuit is decreasing?
Guys, not everyone has had the same education. Op might be interested in circuirs but hasnt had the proper math education. Just because he says it in the video, doesnt mean that everyone will know what it is. I mean, I've been in circuits classes in which people havent taken calculus before and dont even know what derivatives or integrals are.
I come up with a conclusion. 1. A teacher bad at teaching is not your fault. 2. If you failed to study ahead before your class is your fault. -------------------------------------- If you will have both conditions, it would be great. However, not everyone is lucky to get 1. but here is the organic chemistry tutor.
Sw-- sewage only -- ur descript -- sewage facility only! There be: "ON | OFF only!" Shared circuit then! Radar net -- Oriental Tribal - right now -- TTY static!
RL circuit time domain When a magnetic field inside a solenoid varies with time, a curly non-coulomb electric field is observed both inside and outside the solenoid. A coulomb electric field results and we note that an attempt to change the current in the coil induces an emf in the same coil and makes the coil sluggish to respond to current changes. Electrostatics and circuits belong to one science not two. To learn the operation of circuits it is instructive to understand Current, the conduction process, resistors and Voltage at the fundamental level as in the following two videos: i. ua-cam.com/video/TTtt28b1dYo/v-deo.html and ii. ua-cam.com/video/8BQM_xw2Rfo/v-deo.html It is not possible in this post to discuss the production of induced emfs in inductors in detail. The last frame References in video #1 lists two textbooks 3 and 4 which discuss in detail with a series of sequential diagrams the physical processes to explain the operation of inductors and RL circuits. RL circuit frequency domain The existence of a sinusoidal current resulting from the application of a sinusoidal voltage to an inductor is a characteristic of the non-Coulomb electric field that is proportional to the rate of change in current causing a changing magnetic field. The current is a result of an opposing Coulomb electric field, which is a result of polarization by the non-Coulomb electric field associated with the changing magnetic field, and the current is a consequence of the resultant field of the applied field and the Coulomb electric field in the inductance coil. Inductors find applications as filters in power supplies and in resonant circuits in tuned amplifiers. If we increase the “frequency” of the input voltage to an inductor, the “rate of change” of the input voltage and the applied field is “greater than” the rates obtained with applied voltages at lower frequencies. At low frequencies, this causes a smaller induced opposing electric field and emf, therefore, large currents will flow within small intervals of time in the coils of the inductor. In the limit, if the input is a dc voltage, the current will become so large that the inductor will burn out. In an inductor, the opposition to the applied voltage which is changing the current is instantaneous and so, the current can only follow after the applied field has overcome the opposing emf. In an inductor for sinusoidal currents, the current lags the voltage by 90 degrees if the inductor is pure, and less if a resistance is in series with it; the inductor fights before current flows. If an inductor weren’t to fight, you will get energy for free! Faraday's Law and self-induced emf - video lectures by North Carolina State Univ faculty This is a link to a video lecture by NCSU faculty on Faraday's Law. Important 7. Faraday's Law Watch from 8.0 minute. Ch22L1a ua-cam.com/video/ktGL5cEB82I/v-deo.htmlsi=u9vH33gaX1Wy5JvF 8. Non-coulomb electric field - curly-patterned fields Watch from the beginning. Ch22L1b ua-cam.com/video/nV6xg-OuxoY/v-deo.htmlsi=UjJBG3wDjazfeQMM The second link is to a video lecture on self-induced emfs in solenoids (inductors). 9. Self-induced emf in a solenoid Ch22L2a Watch from 10.30 minute. ua-cam.com/video/RJ0J_TL-wUQ/v-deo.htmlsi=qPZ74uD-m6weyFlb Low pass filters are built using L-R circuits in simple applications. Therefore, we say the inductor “blocks high frequencies” and acts as a “short circuit” at low frequencies as if the inductor was not there but a wire. It is not possible in this post to discuss in more detail current in inductor circuits and inductive reactance with sequential diagrams (textbook 4, see below). The last frame References in video #1 lists textbooks 3 and 4 which discusses topics on inductance and inductors in more detail using a unified approach and provides an intuitive understanding of inductive reactance. It also describes with sequential diagrams how an inductor develops the induced emf. Textbook 4 is here techsarworld.com/product-detail/fundamentals-of-electric-theory-and-circuits-559 shows how the current lags the voltage across the inductor by 90 degrees for sinusoidal input voltages using sequential diagrams. PPTs and Videos with animations for all the ten chapters and a few applications Regulated DC Power Supply, Differential Amplifier and Transformer coupled audio power amplifier of the book Fundamentals of Electric Theory and Circuits are available for download and viewing here techsarworld.com/download-resource/fundamentals-of-electric-theory-and-circuits-559
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Full 1 Hour Video AC Circuits: www.patreon.com/MathScienceTutor
Direct Link to The Full Video: bit.ly/3vEFYjI
Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html
Final Exams and Video Playlists: www.video-tutor.net/
Last minute cramming. Fell asleep right at the end. Woke up to a loud af chicken nugget commercial. This is my life now.
Same here man
Exept for me it was a KFC add
Me too lol but mine is Burger King
Damn lol i guess i got the same commercial
@@alanx4121 Agree but *PROCRASTINATION*
This simplified what my teacher overcomplicated. I appreciate how concise and simple you made all of this
I always look for your videos, they are simple and easy to understand. Such teachers like you makes me love physics more.
Dude, you're a genius. I planned to skip these questions in my upcoming FE exams but then I decided to watch your video and lo and behold, you've made it so easy. and even explained what's not in the question. Thank you.
Got an Electrical engineering midterm in 24 hours. Thank You 🙏
What did u do
I'm getting final in 5 hours😄😄
@@Mk369vlogshow was it?
@@extinctcomp3908 passed.
Many many summer's ago i stumbled upon this matter, keep up with those lectures bless you and your family and upbringing.
If not because of JG video, I don't know where I'll be today. Always teach from scratch until someone understand it. I always had A in school anytime I consult JG videos. You are not better than the rest but Best among the best.
Please, I need solution to these questions. I will be very glad if any of them can be solved or if there is any video you've made that you can refer me to. Thanks
ASSIGNMENTS
1. A constant voltage of 150V is suddenly applied to a circuit of resistance 2Ω and inductance 10H. After 5s, the voltage is suddenly increased to 200V. Determine the value of the current after a time t=10.5s. Sketch the approximate shape of the current/time graph.
2. A series RL circuit with R=50Ω and L=10H has a constant voltage V=100V applied at t=0 by the closing of a switch. Find
(a) The equation for I, VR and VL
(b) The current at i=0.5s
(c) The time at which VR=VL
3. A 200µF capacitor is to be connected to a 15V supply via a resistor. The capacitor voltage is approximately 63% of maximum 780ms after switch-on. Select a suitable resistor value and calculate the approximate time for the capacitor to become fully charged.
4. The circuit in fig.Q4 has reached steady state at t=0-. If the make-before-break switch moves to position b at t=0, calculate it for t>0.
5. A series RLC with R=200Ω, L=0.1H, C=100µF has a constant voltage V=200V applied at t-=0. Find the current assuming the capacitor has no initial charge.
6. A series RLC circuit with R=5Ω, L=0.1H, C=500µF has a sinusoidal voltage V=100sin(250t+ɸ)V applied at a time when ɸ=00. Find the current.
7a. Explain the following terms in relation to a transient circuit
(i) Time constant in R-C circuit
(ii) Transient response
(b) In a parallel RLC circuit, R=50Ω, L=0.5H, C=12.5µF. Derive the expressions for the inductor current when i=100mA. Calculate the current after 2ms
You saved my degree. I am forever grateful.
Love this guy! he's far better than khan academy with explanations!
still respect to both tho. they have helped a lot of problematic engineering students ♥️
wait why are you even comparing them? khan academy doesn't even have this to start with. But personally, I feel sal can explain things better.
@@FS-me8mj Sal tries to get you to understand the concept and ideas behind everything, but often ends up overcomplicating and deviating, and JG just tells you what you need to do to pass exams ... so depends on how you prefer.
I have learned more from the organic chemistry tutor than I have in any lecture hall.
i know it's an old vid but you have excellent talent! I'll crush the test thanks to you
Problem at 4:30--the current cannot decrease exponentially as stated when the switch is opened because open switch = open circuit = zero current, leading one to conclude that current decreases to zero instantaneously. In practice, as current decreases at a very high rate when switch is opened, di/dt is very high, energy stored in coil's magnetic field is discharged into circuit at a very high rate, a very high voltage is developed in the coil opposing the drop in current, that voltage opposes the battery voltage and is many times higher, and the air between the opening switch contacts is ionized, allowing a spark of current to flow in the direction opposite to the original current to dissipate the power supplied by the inductor. You have here the basis of the battery-powered automotive ignition circuit.
Things gets simplified here. Thank you very much
he said LR rather than RL but still managed to understand what a guy
This is extremely well done. Thank you very much.
Thanks❤ May God bless you abundantly ❤❤❤
thank you so much for your informative tutorials
I have whole elcetro mechanics in back log and i have exam on this Friday today is tuesday. I gonna put my bet on you.
You are amazing man! Thanks a lot!
Thank you, oh my god. Also 10/10 accent
Jules hi
Jules
damn you guys are thirsty, should of just said A/S/L
what is wrong with people on the internet bruh
Dude I thought I was the only one. Everytime I watch Khan academy im over here sweating 🥵🥵
Exam in exactly 24 hours, I’d say I’m on the lower end of procrastination compared to some here, but I had to spend the last 5 days Nodal, Mesh, Linearity, Max Power, Thevenin’s, Norton’s, Source Transformation, Op-Amps, Capacitors, RC Circuits (still working on getting that down) because I took this entire semester for granted aaaand now I’m here. Wish me luck lmao
how did you do
How was it?
Yo I had no idea Mark Wahlberg was so good at Physics. All kidding aside, your videos are dope and have really helped me.
My exam is tomorrow. Wish me luck guys!
how'd it go
@@celeryystick Oh man, it's been over a year since I took the exam. I forgot how well I did, but I got an A- in the course.
Joseph G. Hotto nice man are you in university?
@@celeryystick Yes
Did you graduate yet😂 did everything just somehow work out
great thanks bro. its simple to understand.
Thanks for all you do 🤗
Another great set of examples helping us to understand the intricacies of these calculations. I don't yet understand how capacitors and inductors differ in their purposes for a single circuit. When do you use one or the other for a single circuit and why?
you are amazing!! thank you
@"The Organic Chemistry Tutor" - Can you possibly explain me one thing that I find hard to understand.
Lets say we have an inducting coil, but it is make of a super-conductor. We fill that super-conducting coil with current and store energy in magnetic field that is created. We unplug the coil from the current source and current flows forever, because there is no resistance.
Now comes the difficult part I don't understand: since now energy is stored in a magnetic field, and stored energy is a state of higher potential, wouldn't be normal to expect magnetic field to want to collapse back to zero and in process coil current will fade away to zero, as well?
Essentially, never mind that resistance in super-conductor is zero, the magnetic field would want to collapse, regardless of what resistance is, because it's on a higher potential?
I'll get back to you
Thank you 😊
Nicely Explaination
Nice, which app does he use to make this videos?
3:34 how do you put that on a calculator and got 0.472 amps? I got syntax error.
I just got a completely different answer. I can't figure out what he did.
For the second problem... Why do we use 0.174A as our current while we said it changes? Should we not use the max current driven by the battery?
Late reply but better late than never. You use .174A because it's asking you to find values like voltage at that moment, 8 ms. So in that moment, the current would be .174 A.
It helllllps a lot thankyousosososomuch
the equation used at 3:20 is wrong when the circuit is open the is no 1-e the 1 is obsolete
16.31 So our final answer for part a should have had a negative even though there wasn't one in the equation?
For #1, we used the I equation which represents current increasing, the 1-e one, but we got a +EMF which tells us that the current in this circuit is decreasing?
How did we come up with the formula to find the current after so many seconds?
the -ve signs in 7.28V 4.72V are totally wrong. If the L is replaced by R2 will u get -ve voltages as well?
thank you so much
how can you get 0.472A and what is the value of e?
we said that the inductor doesn't dissipate power so why can we find the value of the power here???
Am I wrong or could you have solved the 99.4% by setting the 1-e^(-t/~) =.994 then do the natural log?
You can do that too!
I think based on your orientation of + and - on the voltage drops of the passives that your sign was wrong. Just a thought I could be wrong as well.
May be I will pay all the fee to this guy......
my new best friend
thank you
What does the "e" mean? Ln?
ur a dumbass lol
E means that your head was empty when you learned it in class or this video. E=Empty
e = electro motive force, Emf(V)
e is just a constant. Ya ln.
Guys, not everyone has had the same education. Op might be interested in circuirs but hasnt had the proper math education. Just because he says it in the video, doesnt mean that everyone will know what it is. I mean, I've been in circuits classes in which people havent taken calculus before and dont even know what derivatives or integrals are.
I come up with a conclusion.
1. A teacher bad at teaching is not your fault.
2. If you failed to study ahead before your class is your fault.
--------------------------------------
If you will have both conditions, it would be great.
However, not everyone is lucky to get 1. but here is the organic chemistry tutor.
Plz add videos for rl rc and rlc transients for dc excitation..
question: how does it work if im trying to figure the time for the current to reach its maximum value since you can't natural log 0?
95% charge at 3*tau, or 99% at 5tau
Man, I still don't understand this. I wish your vids had more complex and useful problems.
What happened to part d at the end?
Can I calculate the energy stored in a coil without having the current?
Sw-- sewage only -- ur descript -- sewage facility only! There be: "ON | OFF only!"
Shared circuit then! Radar net -- Oriental Tribal - right now -- TTY static!
Thanks!
God bless you
Awesome
at part d) is there another way how to calculate the voltage across the inductor?
Just take antilogs and switch sides or directly use a log table
Gud explanation but audio is low
Thanks
Thanks!!!
Cramming is literally the fuel to energy boost.
It seems that in exercise 2, your answer didn't answer the question (d)
9:59 hahah feel you bro
RL circuit time domain
When a magnetic field inside a solenoid varies with time, a curly non-coulomb electric field is observed both inside and outside the solenoid.
A coulomb electric field results and we note that an attempt to change the current in the coil induces an emf in the same coil and makes the coil sluggish to respond to current changes.
Electrostatics and circuits belong to one science not two. To learn the operation of circuits it is instructive to understand Current, the conduction process, resistors and Voltage at the fundamental level as in the following two videos:
i. ua-cam.com/video/TTtt28b1dYo/v-deo.html and
ii. ua-cam.com/video/8BQM_xw2Rfo/v-deo.html
It is not possible in this post to discuss the production of induced emfs in inductors in detail.
The last frame References in video #1 lists two textbooks 3 and 4 which discuss in detail with a series of sequential diagrams the physical processes to explain the operation of inductors and RL circuits.
RL circuit frequency domain
The existence of a sinusoidal current resulting from the application of a sinusoidal voltage to an inductor is a characteristic of the non-Coulomb electric field that is proportional to the rate of change in current causing a changing magnetic field.
The current is a result of an opposing Coulomb electric field, which is a result of polarization by the non-Coulomb electric field associated with the changing magnetic field, and the current is a consequence of the resultant field of the applied field and the Coulomb electric field in the inductance coil.
Inductors find applications as filters in power supplies and in resonant circuits in tuned amplifiers.
If we increase the “frequency” of the input voltage to an inductor, the “rate of change” of the input voltage and the applied field is “greater than” the rates obtained with applied voltages at lower frequencies. At low frequencies, this causes a smaller induced opposing electric field and emf, therefore, large currents will flow within small intervals of time in the coils of the inductor.
In the limit, if the input is a dc voltage, the current will become so large that the inductor will burn out.
In an inductor, the opposition to the applied voltage which is changing the current is instantaneous and so, the current can only follow after the applied field has overcome the opposing emf. In an inductor for sinusoidal currents, the current lags the voltage by 90 degrees if the inductor is pure, and less if a resistance is in series with it; the inductor fights before current flows. If an inductor weren’t to fight, you will get energy for free!
Faraday's Law and self-induced emf - video lectures by North Carolina State Univ faculty
This is a link to a video lecture by NCSU faculty on Faraday's Law.
Important
7. Faraday's Law
Watch from 8.0 minute.
Ch22L1a
ua-cam.com/video/ktGL5cEB82I/v-deo.htmlsi=u9vH33gaX1Wy5JvF
8. Non-coulomb electric field - curly-patterned fields
Watch from the beginning.
Ch22L1b
ua-cam.com/video/nV6xg-OuxoY/v-deo.htmlsi=UjJBG3wDjazfeQMM
The second link is to a video lecture on self-induced emfs in solenoids (inductors).
9. Self-induced emf in a solenoid
Ch22L2a
Watch from 10.30 minute.
ua-cam.com/video/RJ0J_TL-wUQ/v-deo.htmlsi=qPZ74uD-m6weyFlb
Low pass filters are built using L-R circuits in simple applications. Therefore, we say the inductor “blocks high frequencies” and acts as a “short circuit” at low frequencies as if the inductor was not there but a wire.
It is not possible in this post to discuss in more detail current in inductor circuits and inductive reactance with sequential diagrams (textbook 4, see below).
The last frame References in video #1 lists textbooks 3 and 4 which discusses topics on inductance and inductors in more detail using a unified approach and provides an intuitive understanding of inductive reactance.
It also describes with sequential diagrams how an inductor develops the induced emf.
Textbook 4 is here techsarworld.com/product-detail/fundamentals-of-electric-theory-and-circuits-559
shows how the current lags the voltage across the inductor by 90 degrees for sinusoidal input voltages using sequential diagrams.
PPTs and Videos with animations for all the ten chapters and a few applications Regulated DC Power Supply, Differential Amplifier and Transformer coupled audio power amplifier of the book Fundamentals of Electric Theory and Circuits are available for download and viewing here
techsarworld.com/download-resource/fundamentals-of-electric-theory-and-circuits-559
Big day today
Congratulations 👰♀️
I watched it.
you made a mistake in question d. it says that "at what rate" but you solved directly the power
for the time constant i got 0.02
And basics of transients
14:16
It would be better if the text is removed
god
Thanks!