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→About Back emf
*[[Back EMF|Back emf]] occurs due to [[Lenz's Law|Lenz's Law]], which states that the direction of the [[Electromagnetic *Induction|induced]] [[Electromotive Force|emf]] is such that it opposes the change causing it.
*In an [[Motor|electric motor]], back [[Electromotive ForceBack EMF|back emf]] increases with the [[speed]] of the [[motor]].
*It limits the current flowing through the motor as the [[speed]] increases.
*In [[Electrical Transformers|transformers]], [[Back EMF|back emf]] is [[Electromagnetic *Induction|induced]] in the [[Primary Coil|primary coil]] when the [[Electrical Current|current]] in the [[Secondary Coil|secondary coil]] changes.