Question

A 240-V dc motor has an armature whose resistance is 1.50Ω. When running at its operating speed, it draws a current of 16.0 A.
(a) What is the back emf of the motor when it is operating normally?
(b) What is the starting current? (Assume that there is no additional resistance in the circuit.)
(c) What series resistance would be required to limit the starting current to 25 A?


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  • CreatedAugust 29, 2015
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