Solved: Youre a safety engineer reviewing plans for a universitys new high-rise dorm

Chapter 27, Problem 59

(choose chapter or problem)

Youre a safety engineer reviewing plans for a universitys new high-rise dorm. The elevator motors draw 20 A and behave electrically like 2.5-H inductors. Youre concerned about dangerous voltages developing across the switch when a motor is turned off, and you recommend that a resistor be wired in parallel with each motor. (a) What should be the resistance in order to limit the emf to 100 V? (b) How much energy will the resistor dissipate?

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