Understanding Back EMF: What is it & What Does it Do?

[Amr Elsayed]

Hello all, I have got a hard time thinking of what back E.M.F is. Does it appear only at the moment of switching and closing the circuit ? why it's even there and what is its relation with E.M.F .
If some one can provide me with a brief and good source that elegantly explains the whole thing I will be grateful.
Regards

 

[berkeman]

Hello all, I have got a hard time thinking of what back E.M.F is. Does it appear only at the moment of switching and closing the circuit ? why it's even there and what is its relation with E.M.F .
If some one can provide me with a brief and good source that elegantly explains the whole thing I will be grateful.
Regards

As I said in your other thread, try starting with wikipedia.

 

[CWatters]

Have you looked at sites like this.
https://en.m.wikipedia.org/wiki/Counter-electromotive_force

 

[David Lewis]

When current increases in a conductor, a voltage (proportional to the rate of current change) is self-induced that opposes the current.