Inductor leading lagging voltage-current

  • Thread starter Thread starter superslow991
  • Start date Start date
  • Tags Tags
    Inductor
AI Thread Summary
In an AC circuit, the voltage across an inductor leads the current due to the relationship defined by Lenz's Law, which states that the inductor resists changes in current. This results in the voltage and current not peaking simultaneously, with the current lagging behind the voltage. The voltage is proportional to the derivative of the current, meaning that changes in voltage cause delayed changes in current. Additionally, if the circuit is interrupted, a sudden drop in current can generate a significant voltage spike. Understanding these principles is crucial for grasping the behavior of inductors in AC circuits.
superslow991
Messages
78
Reaction score
1
Trying to understand how in a conductor in an Ac circuit, the voltage leads the current.
AS far as i read the voltage and the current max do not peak at the same time? Also because of lenz law the behavior of the coil resist the build up of the current so it takes time for a change in voltage to force a change in current?
Any explanation will help.
 
Physics news on Phys.org
superslow991 said:
Trying to understand how in a conductor in an Ac circuit, the voltage leads the current.
AS far as i read the voltage and the current max do not peak at the same time? Also because of lenz law the behavior of the coil resist the build up of the current so it takes time for a change in voltage to force a change in current?
Any explanation will help.

what education level are you ... you listed your thread as I for intermediate but your question indicates basic
... just so people can give you a good and relevant answer

for a start you can do some reading, there is tons of info online

http://www.bing.com/search?q=Induct...opResult&FORM=IETR02&conversationid=&pc=EUPP_Dave
 
Did you by any chance mean "inductor" when you wrote conductor?

To actually answer your question, I must ask whether you know what a derivative is in math. Because what actually happens in an inductor/coil is that the voltage is proportional to the derivative of the current. Or stated the other way around, the current is proportional to the integral of the voltage.

That of course means, yes, the current "follows sluggishly" to the changes of an external voltage. Interestingly, it also means that cutting the wire in a circuit like that causes an huge voltage because the current is suddenly forced to zero, and the derivative of that sudden drop is very large.
 
  • Like
Likes superslow991
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'
So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
Back
Top