1. Explain why the e.m.f. generated in
the armature of a D.C. motor is called
the back e.m.f. ?
Answers
Answered by
5
Answer:
When the armature of a DC motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence emf is induced in them as in a generator. The induced emf acts in opposite direction to the applied voltage V (Lenz's law) and is known as Back EMF or Counter EMF (Eb).
Answered by
0
Answer:
When a dc voltage V is applied across the motor terminals, the armature starts rotating due to the torque developed in it. As the armature rotates, armature conductors cut the pole magnetic field, therefore, as per law of electromagnetic induction, an emf called back emf is induced in them.
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