Voltage spike

Discussion in 'General Electronics Chat' started by Webby, Aug 11, 2008.

  1. Webby

    Thread Starter Active Member

    Jun 15, 2008
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    Hi, when a magnetic field collapses a voltage spike is induced what is meant by "CEMF". Bit confused I know its something to do with "Electromotive Force.

    Thanks
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    CEMF stands for Counter ElectroMotive Force. The voltage induced by the field in the inductor will have a polarity opposite to the applied voltage.
     
  3. Webby

    Thread Starter Active Member

    Jun 15, 2008
    66
    0
    Thanks for that do you mean then the induced voltage spike will flow in a different direction to the applied voltage?

    Is "Back EMF" the same as "Counter EMF"?
     
    Last edited: Aug 11, 2008
  4. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
    Plus, the voltage of the back EMF or CEMF will be proportional to the resistance of the circuit in parallel with the inductor, when the voltage applied ceases to exist.
     
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