A motor has coils with a resistance of 30. Ω and operates froma voltage of 240 V. When the motor is operating at its maximumspeed, the back emf is 145 V. Find the current in thecoils (a) when the motor is first turned on and (b) when themotor has reached maximum speed. (c) If the current in themotor is 6.0 A at some instant, what is the back emf at thattime?

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
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Chapter13: Electromagnetic Induction
Section: Chapter Questions
Problem 61P: A 120-V, series-wound motor has a field resistance of 80 and an armature resistance of 10. When it...
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A motor has coils with a resistance of 30. Ω and operates from
a voltage of 240 V. When the motor is operating at its maximum
speed, the back emf is 145 V. Find the current in the
coils (a) when the motor is first turned on and (b) when the
motor has reached maximum speed. (c) If the current in the
motor is 6.0 A at some instant, what is the back emf at that
time?

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