An electric motor in a hair dryer is running at its normal

Chapter 22, Problem 22.33

(choose chapter or problem)

An electric motor in a hair dryer is running at its normal constant operating speed and, thus, is drawing a relatively small current, as in part (b) of Example 12. The wire in the coil of the motor has some resistance. What happens to the temperature of the coil if the shaft of the motor is prevented from turning, so that the back emf is suddenly reduced to zero? (a) Nothing. (b) The temperature decreases. (c) The temperature increases (the coil could even burn up).

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