1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Difference between induced emf and counter emf

  1. Oct 31, 2012 #1
    What is the difference between induced electromotive force and counter electromotive force? The way they are generated seems the same to me. Can someone tell me the difference and how they are different?
  2. jcsd
  3. Nov 4, 2012 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Same thing. Counter-emf is generated when a motor is running & acting like a generator in consequence. An unloaded motor, when driven, similarly acts like a generator, generating emf. The back emf cancels the applied emf and no current Is drawn.

    A motor, when stalled, does not generate any back emf, thus uses max. current.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook