Home
Class 12
PHYSICS
What is meant by back e.m.f.in a motor?...

What is meant by back e.m.f.in a motor?

Text Solution

Verified by Experts

It is e.m.f. induced in the coil of a motor as it rotates in the magnetic field. It is called back emf as it oppose the rotation of the coil.
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    PRADEEP|Exercise Solved Examples (b)|1 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    PRADEEP|Exercise Short Answer Qusetions|2 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    PRADEEP|Exercise Exercise|191 Videos

  • ELECTROMAGNETIC WAVES

    PRADEEP|Exercise II Focus multiple choice question|5 Videos

Similar Questions

Explore conceptually related problems

What is meant by a.m.u. ?

What is meant by S.H.M. ?

What is meant by simple harmonic motion (S.H.M.) ?

The induced e.m.f. is sometimes called back e.m.f. Why ?

When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it ?

What is a motor unit?

The resistance of the armature of an electric motor is 55 ohm. The motor draw a current of 2 A when running at 220 V. What is the back e.m.f ?

A small d.c. motor operating at 200 V draws a current of 5.0 amp.at its full speed of 3000 r.p.m. The resistance of the armature of the motor is 8.5 Omega . Determine the back e.m.f. of the motor. Obtain the power input, power output and efficiency of motor.