1 A flux of 30 mWb links with a 1200 turn coil when a current of 5 A is passing through the coil. Calculate (a) the inductance of the coil, (b) the energy stored in the magnetic field, and (c) the average e.m.f. induced if the current is reduced to zero in 0.20 s

1 A flux of 30 mWb links with a 1200 turn coil when a current of 5 A is passing through the coil. Calculate (a) the inductance of the coil, (b) the energy stored in the magnetic field, and (c) the average e.m.f. induced if the current is reduced to zero in 0.20 s

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 3RQ

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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.

Question

1 A flux of 30 mWb links with a 1200 turn
coil when a current of 5 A is passing through
the coil. Calculate (a) the inductance of the
coil, (b) the energy stored in the magnetic
field, and (c) the average e.m.f. induced if
the current is reduced to zero in 0.20s
[(a) 7.2 H (b) 90J (c) 180 V]
2 An e.m.f. of 2 kV is induced in a coil when a
current of 5 A collapses uniformly to zero in
10 ms. Determine the inductance of the coil.
[4 H]

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