How does change in current induce electromotive force

  • #1
312
0
Statement:
Reviewing the definition of inductance, I found the following definition from Wikipedia:
Inductance is the property in an electrical circuit where a change in the current flowing through that circuit induces an electromotive force (EMF) that opposes the change in current.
Question
Can someone explain to me how change in current will induce an electromotive force (one that will oppose the present current)? And what is meant by a magnetic field is inductive?


Thanks,


JL
 
Last edited:

Answers and Replies

  • #2
211
0


Are you familiar with Lenz's Law? A current in a circuit will produce a magnetic field, so when current is changed, magnetic field is changed, and a changing magnetic field will induce an EMF that opposes the change. If I'm not mistaken, this is what people refer to as "back-EMF" in circuits.
 
  • #3
312
0


Are you familiar with Lenz's Law? A current in a circuit will produce a magnetic field, so when current is changed, magnetic field is changed, and a changing magnetic field will induce an EMF that opposes the change. If I'm not mistaken, this is what people refer to as "back-EMF" in circuits.
Is there a picture or video I can see of this, so I can see the direction of the EMF in relation to the magnetic field?
 
  • #4
negitron
Science Advisor
842
1


See the right-hand grip rule which relates current direction through a conductor to magnetic field orientation. Induced EMF will be in opposition to the current flow.
 

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