The induced voltage in an ac or dc motor that opposes the applied voltage.
Counter electromotive force. Voltage induced in an inductor or the armature coil of a motor by the flow of changing current through the inductor or armature. The polarity of this voltage is opposite (counter) to that of the change of current. Also called back voltage.
A voltage produced by a transformer that has the opposite polarity of the voltage that caused it. Often referred to as kick emf.