Thanks! This was actually a VERY helpful video. As a beginner in this area of science, I am very grateful for the thorough explanation and example. Thank you.
No. The voltage builds up across the inductor. Let me explain: As an example, say The inductor current was 100mA before the switch opened when it was in steady state. Say the switch opens and the current comes to zero in 1 microseconds. The inductor is 10mH. The voltage across the inductor is L*di/dt. di=100mA, dt=1 microsecond, and voltage across ends up being 1000V. There you go.
@@gustavomarcelo7250 i meant switch opens. sorry. i typed that late at night yesterday. I fixed it. In a real situation, that switch would likely be a transistor. The drain or collector of the transistor would be the part feeling the 1000V and it would likely blow the transistor. usually to avoid this, you would add a diode in parallel with the inductor and it would "point" up toward the VCC supply. This orientation works because as soon as the switch reaches voltage of VCC+V_fb (V_fb is the forward bias of the diode; about 0.7V), it would conduct current and prevent the switch from building up a voltage past VCC+V_fb.
The green arrows in this video are confusing. You should have used different colored arrows for the current due to the induced EMF vs. the DC source source current.
Inductive reactance The inductive reactance is expressed in ohms, and is useful to determine steady-state current values to sinusoidal voltage inputs. It is to be noted that though the value of the reactance is expressed in ohms, it was not obtained by computing a resistance, as of resistors. The current in the wires of an inductive circuit is a result of the applied field and an opposing coulomb electric field, which is set up by surface charge as a result of polarization of the inductor by the non-coulomb curly patterned electric field associated with the changing magnetic field due to the changing current and the current resulting thereof by applying the relation J = σE(NET) where E(NET) is the resultant field of the applied field and the coulomb electric field, and σ is the conductivity. For a comprehensive description of the mechanism of current lagging the voltage across an inductor see the book references below. Electrostatics and circuits belong to one science and not two, that of electricity and magnetism. To know how they are unified visit this link matterandinteractions.org/articles-talks/ and view the article 'A unified treatment of electrostatics and circuits. B. Sherwood and R. Chabay, unpublished. (1999)' pdf. For a detailed discussion of the physics of inductors, curly patterned non-coulomb electric field, coulomb field and lagging currents in a inductive circuit at different frequencies of sinusoidally varying voltages see "Electric and Magnetic Interactions" by Chabay and Sherwood www.matterandinteractions.org or Fundamentals of electric theory and circuits by Sridhar Chitta www.wileyindia.com/fundamentals-of-electric-theory-and-circuits.html For a lecture by Prof Ruth Chabay on surface charge in a simple dc circuit visit ua-cam.com/video/-7W294N_Hkk/v-deo.html
A single Time Constant is about the time taken for the circuit to reach 67% of where it is going. However, the closer it gets to the finish, the longer it takes to finish (Because the voltage differences become smaller, which are ultimately responsible for driving the current). So to keep going to almost 100% (Theoretically it will never really reach there), is approximated by 5 Time Constants. That's considered close enough.
Current needs a loop to travel through. Instead the voltage increases to a very high value due to the rate of change of the current being very fast. This value could cause the switch terminal to arch due to the breakdown voltage being reached between the two terminals. Like lightning when charge accumulates in the clouds to several millions of volts, the air between the clouds and the earth acts as a dielectric material but it breaks down with such high voltage and literally conducts electricity in the form of lightening. I should add that the current doesn’t stop instantly. Resistances in the wire prevent it from happening.
Circuito é um caminho pra percorrer informações por corrente elétrica que conecta uma entrada por onde essa informação é introduzida e processada através de microprocessadores que comanda e coordena até um ponto em que ela se divide dando saída para o som e expandindo a imagem numa tela e todas retornam pra mesma placa de armazenamento,através de um conector na saída do circuito você consegue mover,transmitir e até mesmo modificar essas informações.
In an inductive circuit (shown in the video) the Voltage always precedes the Current by 90 degrees (It starts flowing through the wire before the current does). This is because the electrons create resistance in the wire making up the inductor. Because this resistance (which slows down the electrons for a very short period of time) only affects the flow of electrons the Voltage will begin to flow BEFORE the current does (but quickly catches up with the Voltage.)
The electrons don’t create resistance necessarily-a dc current passing through an inductor causes the inductor to behave as a short circuit. The change in current does cause a change in resistance though. It does so because it causes a voltage to appear across the inductor. This is why a sinusoids signal produces an impedance across the inductor. The voltage changes and therefore the current changes with the current lagging 90 degrees.
The electrons don’t create resistance necessarily-a dc current passing through an inductor causes the inductor to behave as a short circuit. The change in current does cause a change in resistance though. It does so because it causes a voltage to appear across the inductor. This is why a sinusoids signal produces an impedance across the inductor. The voltage changes and therefore the current changes with the current lagging 90 degrees.
This video shows the flow of electrons in the conductor. The electrons always go from the negative terminal of power source to the positive. But they didn't really know that back in the day when electricity was first studied as a new field of science. So they just decided to make a rule that electricity flows from positive to negative. This can cause some confusion.
by Marcus Tornea As current flows in a wire coil, it creates a magnetic field. This sudden appearance of magnetic field induces a secondary current according to Faraday's laws of electromagnetic induction, which flows in the opposite direction, as stated in Lenz's law. This is known more commonly as the "back EMF". Hope I helped.
True. That's why, in professional cabinets, like RCF, big inductors are used in passive crossovers. The more you raise volume, the more the iron core will induct & make the woofer sound louder & the impedance will be lower. Cheap crap cabinets use cheap crossovers to low cost, leading to mediocre sound quality.
because a capacitor smooths out voltage an inductor smooths out or resists changes IN CURRENT FLOW, not voltage remember it as Capacitor relates to Voltage (electrical pressure) inductor relates to current flow (speed of the electricity)
The intonation or emphasis in the speech is a bit off at times. For example: "whereas a capacitor uses voltage to store *energy*, the inductor uses current". It should be: "whereas a capacitor uses *voltage* to store energy, the inductor uses current".
The current causes a magnetic field where energy is stored. The magnetic field is directly proportional to the current. Think about it this way: with a capacitor, voltage creates an electric field. That voltage is discharged when the electric field collapses. In an inductor, current creates a magnetic field. That current is discharged when magnetic field collapses.
In purely inductive circuits (which do not exist in reality) there is no power loss. Inductors have resistance, called effective series resistance, which is the source of power loss (joule heating).
Glad you presented the flow of electrons correctly. I cannot understand why the industry keeps hanging on to the ‘conventional’ explanation. Those doing so are promoting a falsehood. Really?!. When science clarifies the understand then change the presentation.
Thos electrons are flowing the wrong way. Vacuum tubes, xray tubes, tv tubes, electrons leave the cathode and flow to the positive anode. In electroplating the cathode is - the anode that gets plated is +.
You are wrong to say that the inductor retards the turning on of the bulb after the switch is closed. The light bulb will turn on as soon as the switch closes.
Induction is not relevant in current without capacitance. You can have a DC source (dinamo motor for example) and run a light bulb as long as dinamo is turning.
Who stole the video, you, "Engineering Technology Simulation Learning Videos", or "Tech Maker"? I'm saying this because this exact video is also in: ua-cam.com/video/dza3Vjxx8kU/v-deo.html
Conventional electricity flows from positive to negative. However, the negative electrons (true flow of current) always flow from negative to positive. In the early days of discovering the properties of electricity it was believed that electricity flowed from positive to negative. They failed to rectify the explanation for some reason.
Don't open an inductor circuit without creating a path do current flow. You'll cause considerable damage to the circuit. On this circuit, the switch will be damaged his contacts.
"The purpose of an inductor is to oppose any change in the magnitude of current..." but at the end of the video, current flows like hell and does not care about that damn inductor! :|
Switch closes. Inductor takes about 2 milisecond to build up full strenght (Store 100% of it's magnetic field) bulb will delay for that 2 milisecond before coming on even though the switch is on. (Inductor needs to charge 100% before the bulb light up in other words) After inductor charge to 100% (Bulb glows to max lumens) Swtich Opens. Store Charge in Inductor Flows and arc where the switch is opening at. (This is where the inductor drains it's charge)
Good explanation. Still don't get it
Hahaha that's exactly my thoughts on the matter :D
😂
True🤣🤣
Hahahaha thats EXACTLY what i was thinking 😂😂😂
I hate professors like this. They expect you to be a God of all knowing so have to know everything he mentions.
Thanks! This was actually a VERY helpful video. As a beginner in this area of science, I am very grateful for the thorough explanation and example. Thank you.
This Video is GOLD!! thank you for taking the time!!
This helped me understand what and why we use inductance. Thanks.
Where is the location of the voltage build up when the switch opened?Is it across the switch?
No. The voltage builds up across the inductor. Let me explain:
As an example, say The inductor current was 100mA before the switch opened when it was in steady state. Say the switch opens and the current comes to zero in 1 microseconds. The inductor is 10mH. The voltage across the inductor is L*di/dt. di=100mA, dt=1 microsecond, and voltage across ends up being 1000V.
There you go.
@hyperelectron-tg5cz Switch close or open?
@@gustavomarcelo7250 i meant switch opens. sorry. i typed that late at night yesterday. I fixed it. In a real situation, that switch would likely be a transistor. The drain or collector of the transistor would be the part feeling the 1000V and it would likely blow the transistor. usually to avoid this, you would add a diode in parallel with the inductor and it would "point" up toward the VCC supply. This orientation works because as soon as the switch reaches voltage of VCC+V_fb (V_fb is the forward bias of the diode; about 0.7V), it would conduct current and prevent the switch from building up a voltage past VCC+V_fb.
is the induced back emf goes to maximum point instantly, i mean when the switch is on? and then decrease with increasing flux?
great explanation... ive known of inductance and electromagnets, but never knew how to put them together in this sense. thanks alot :)
Shite using DC as an example. AC should be used in these as the field changes much more involved
The green arrows in this video are confusing. You should have used different colored arrows for the current due to the induced EMF vs. the DC source source current.
Inductive reactance
The inductive reactance is expressed in ohms, and is useful to determine steady-state current values to sinusoidal voltage inputs. It is to be noted that though the value of the reactance is expressed in ohms, it was not obtained by computing a resistance, as of resistors. The current in the wires of an inductive circuit is a result of the applied field and an opposing coulomb electric field, which is set up by surface charge as a result of polarization of the inductor by the non-coulomb curly patterned electric field associated with the changing magnetic field due to the changing current and the current resulting thereof by applying the relation J = σE(NET) where E(NET) is the resultant field of the applied field and the coulomb electric field, and σ is the conductivity.
For a comprehensive description of the mechanism of current lagging the voltage across an inductor see the book references below.
Electrostatics and circuits belong to one science and not two, that of electricity and magnetism. To know how they are unified visit this link
matterandinteractions.org/articles-talks/ and view the article 'A unified treatment of electrostatics and circuits. B. Sherwood and R. Chabay, unpublished. (1999)'
pdf.
For a detailed discussion of the physics of inductors, curly patterned non-coulomb electric field, coulomb field and lagging currents in a inductive circuit at different frequencies of sinusoidally varying voltages see "Electric and Magnetic Interactions" by Chabay and Sherwood
www.matterandinteractions.org
or
Fundamentals of electric theory and circuits by Sridhar Chitta
www.wileyindia.com/fundamentals-of-electric-theory-and-circuits.html
For a lecture by Prof Ruth Chabay on surface charge in a simple dc circuit visit
ua-cam.com/video/-7W294N_Hkk/v-deo.html
2:14 inductor uses magnetic field to store energy.
Inductor stores energy in magnetic field, while capacitor stores energy in electric field.
How did we know that the current reaches maximum value at '5' time constants , why not 4 or 6 , is it generalised result ?
A single Time Constant is about the time taken for the circuit to reach 67% of where it is going. However, the closer it gets to the finish, the longer it takes to finish (Because the voltage differences become smaller, which are ultimately responsible for driving the current). So to keep going to almost 100% (Theoretically it will never really reach there), is approximated by 5 Time Constants. That's considered close enough.
The inductor stores energy in the magnetic field, not "in current". (2:20ish)
Why there was still has spark when switch open, the bulb would not consume?
Current needs a loop to travel through. Instead the voltage increases to a very high value due to the rate of change of the current being very fast. This value could cause the switch terminal to arch due to the breakdown voltage being reached between the two terminals. Like lightning when charge accumulates in the clouds to several millions of volts, the air between the clouds and the earth acts as a dielectric material but it breaks down with such high voltage and literally conducts electricity in the form of lightening.
I should add that the current doesn’t stop instantly. Resistances in the wire prevent it from happening.
Having these visual explanations are very helpful 👌 🙏
Why is the current changing (stated at 1:07) if the supply is a DC supply?
Shaun Vadaketh due to switching transients
When to use capacitor and inductor in ckt.please let me know
what means rapidly, with what speed
Soo is the inductor and actual object or are there different type of inductor examples? Where are inductors use more?
Well now I’m confused. Another video says that inductors only effect AC voltage, but this video is demonstrating it with DC. So which is it?
Hello could you test this software? Browse for circuit solver on the playstore!
Circuito é um caminho pra percorrer informações por corrente elétrica que conecta uma entrada por onde essa informação é introduzida e processada através de microprocessadores que comanda e coordena até um ponto em que ela se divide dando saída para o som e expandindo a imagem numa tela e todas retornam pra mesma placa de armazenamento,através de um conector na saída do circuito você consegue mover,transmitir e até mesmo modificar essas informações.
Is there a difference between inductor and solenoid
Actually every solenoid with zero resistance can be called inductor but every inductor is not solenoid
i think in smooths current so not so strenuous on other components
Nice simplification, I'm still looking for an in depth explanation of the unique properties.
In an inductive circuit (shown in the video) the Voltage always precedes the Current by 90 degrees (It starts flowing through the wire before the current does). This is because the electrons create resistance in the wire making up the inductor. Because this resistance (which slows down the electrons for a very short period of time) only affects the flow of electrons the Voltage will begin to flow BEFORE the current does (but quickly catches up with the Voltage.)
The electrons don’t create resistance necessarily-a dc current passing through an inductor causes the inductor to behave as a short circuit. The change in current does cause a change in resistance though. It does so because it causes a voltage to appear across the inductor. This is why a sinusoids signal produces an impedance across the inductor. The voltage changes and therefore the current changes with the current lagging 90 degrees.
The electrons don’t create resistance necessarily-a dc current passing through an inductor causes the inductor to behave as a short circuit. The change in current does cause a change in resistance though. It does so because it causes a voltage to appear across the inductor. This is why a sinusoids signal produces an impedance across the inductor. The voltage changes and therefore the current changes with the current lagging 90 degrees.
Thanks. But the flow of current is from positive to negative. do you explain why it is from -ve to +ve.
This video shows the flow of electrons in the conductor. The electrons always go from the negative terminal of power source to the positive. But they didn't really know that back in the day when electricity was first studied as a new field of science. So they just decided to make a rule that electricity flows from positive to negative. This can cause some confusion.
It's electron flow
Sir, what software do you work on
by Marcus Tornea
As current flows in a wire coil, it creates a magnetic field. This sudden appearance of magnetic field induces a secondary current according to Faraday's laws of electromagnetic induction, which flows in the opposite direction, as stated in Lenz's law. This is known more commonly as the "back EMF". Hope I helped.
Whenever DC supply is given to coil it does not produce field
It produces a constant magnetic field like the dc voltage
True. That's why, in professional cabinets, like RCF, big inductors are used in passive crossovers.
The more you raise volume, the more the iron core will induct & make the woofer sound louder & the impedance will be lower.
Cheap crap cabinets use cheap crossovers to low cost, leading to mediocre sound quality.
What a wonderful and precise demo and explanation, I like it
Good work. Thanks.
But why cant make transformer working?
What happen to the
BEMF completely over looked
Beautiful man tanx alot for plain and simple
so is this considered a flux capacitor, because it stores amperage
Pedro Galdamez ha
A quick note. Current is measured as the flow of electrons and holes, not just electrons.
+rwtfallenjf25132 if u don't know electronic don't change the theory of electronics
+Magadh Taxashil ... what??
can't u read simple english language.
+Magadh Taxashil well your english is very poor so i asked "what."
rwtfallenjf25132
what nonsense .u r dame poor than me .
Nice explanation, easy to understand.
so why would anyone use a capacitor instead of an inductor (or vice versa) in a circuit for preventing voltage spikes?
because a capacitor smooths out voltage
an inductor smooths out or resists changes IN CURRENT FLOW, not voltage
remember it as Capacitor relates to Voltage (electrical pressure)
inductor relates to current flow (speed of the electricity)
Interesting and educative video.
How can do current ?
my confusion on what is an inductor is solved by this video thank u so much
The north and south poles were the wrong way around.
The intonation or emphasis in the speech is a bit off at times. For example: "whereas a capacitor uses voltage to store *energy*, the inductor uses current". It should be: "whereas a capacitor uses *voltage* to store energy, the inductor uses current".
Wow that makes a lot more sense. Stores amps as apposed to volts.
What mean of urs sentenc?
does not store amps or voltage. stores magnetic energy which kind of controls current that passes through it
The current causes a magnetic field where energy is stored. The magnetic field is directly proportional to the current. Think about it this way: with a capacitor, voltage creates an electric field. That voltage is discharged when the electric field collapses. In an inductor, current creates a magnetic field. That current is discharged when magnetic field collapses.
fantastic explanation.
Everything is sorted now with this topic ...
Thanks a lot , Sir🙏
Good video sir, but inductance is defined as Flux linkage per unit current
Isn't that kinda useless if you're using DC instead of AC?
Best fucking video I have seen on inductance!
great
I don't understand. Not explain why,
What causes loss of power in an inductive circuit?
In purely inductive circuits (which do not exist in reality) there is no power loss. Inductors have resistance, called effective series resistance, which is the source of power loss (joule heating).
Wonderful ! Thanks
2:06 comparison with capacitor
Glad you presented the flow of electrons correctly. I cannot understand why the industry keeps hanging on to the ‘conventional’ explanation. Those doing so are promoting a falsehood. Really?!. When science clarifies the understand then change the presentation.
One thing is current, and the other is flow of electrons, you have to be careful with this, specially with all those right hand rules
It's just magnetic field. Not electromagnetic field.
1:51 comaprison with capacitor
Thos electrons are flowing the wrong way. Vacuum tubes, xray tubes, tv tubes, electrons leave the cathode and flow to the positive anode. In electroplating the cathode is - the anode that gets plated is +.
In der Physik ist es genau anders herum.
Helped me a lot/
Good video tutorial, but I still don't get it
Why - → + ????
Current is defined in the opposite direction of the flow of electrons
But when flux just start to build up, i think lamp will light and then quickly dims
No at all. This is the capacitor behavior.
thanks
Good video, but the coil of wire does not have to be wrapped around a magnetic / metal core for the coiled wire to be an inductor! This is incorrect!!
what is l
Don't you have the current going in the direction opposite it's typically depicted as going? You go from plus to minus, no?
Thanks Frank
You are wrong to say that the inductor retards the turning on of the bulb after the switch is closed. The light bulb will turn on as soon as the switch closes.
solenoid
Induction is not relevant in current without capacitance. You can have a DC source (dinamo motor for example) and run a light bulb as long as dinamo is turning.
This circute must is an AC circute
Useful video for students
Didn't follow the math very well, but I now realize that switching off my bedroom light used to come with the possibility of a house fire. Hmmmm.
Bravo
I'm sorry but T is symbolic for the Period not the time constant. PLEASE USE TAU INSTEAD!!!
For bitches who don't know what tau is, it's a Greek letter: τ.
the bulb should turn into bright red to show it's on
Vim pelo Prof. Fernando
👍
Great explanation, however that inductor will KICK like a STRONG HORSE when you OPEN the SWITCH, be Careful!!!!
Who stole the video, you, "Engineering Technology Simulation Learning Videos", or "Tech Maker"?
I'm saying this because this exact video is also in: ua-cam.com/video/dza3Vjxx8kU/v-deo.html
Who invested in physics? With the service woman? Of course you have not heard the right drill? Reverses the magnetic polarity in the drawing.
crap animation shows the current going backwards ... it moves from plus to minus , not the other way around
Conventional electricity flows from positive to negative. However, the negative electrons (true flow of current) always flow from negative to positive. In the early days of discovering the properties of electricity it was believed that electricity flowed from positive to negative. They failed to rectify the explanation for some reason.
Don't open an inductor circuit without creating a path do current flow. You'll cause considerable damage to the circuit. On this circuit, the switch will be damaged his contacts.
🙏🙏🌹🌹🌹🌹
I need to do the science.
Take away. A capacitor uses voltage to store energy & an inductor uses current.
👌
The missile know where it is....
You lost me at "The purpose of an inductor..."
to oppose current
Scurrent change is opposed due to inductor.
An inducter shorts the curcuit if the main source is DC
this a good example of worst the worst explanation..
Boreneo man for real. What’s the point of explaining this shit to someone at the level of an expert when only the noobs are looking this vid up.
"The purpose of an inductor is to oppose any change in the magnitude of current..." but at the end of the video, current flows like hell and does not care about that damn inductor! :|
inductor was so confusing.. T_T
Now in plain English
This is an explanation for folks who already understand . This is not good for folks who need to learn the concepts.
you lost me at flux lines..
Switch closes.
Inductor takes about 2 milisecond to build up full strenght (Store 100% of it's magnetic field) bulb will delay for that 2 milisecond before coming on even though the switch is on. (Inductor needs to charge 100% before the bulb light up in other words)
After inductor charge to 100% (Bulb glows to max lumens)
Swtich Opens.
Store Charge in Inductor Flows and arc where the switch is opening at. (This is where the inductor drains it's charge)
No secrets revealed here
Same petrol dollor education.
J
confusion with confusion. You don't understand how a coil works. You're confusing people who don't understand this yet!