Exercise 26.53 A 1500?W electric heater is plugged into the outlet of a 120?V ci

Question

Exercise 26.53

A 1500?W electric heater is plugged into the outlet of a 120?V circuit that has a 20?A circuit breaker. You plug an electric hair dryer into the same outlet. The hair dryer has power settings of 600 W, 900 W, 1200 W, and 1500 W. You start with the hair dryer on the 600?W setting and increase the power setting until the circuit breaker trips.

Part A

What power setting caused the breaker to trip?

Exercise 26.53

A 1500?W electric heater is plugged into the outlet of a 120?V circuit that has a 20?A circuit breaker. You plug an electric hair dryer into the same outlet. The hair dryer has power settings of 600 W, 900 W, 1200 W, and 1500 W. You start with the hair dryer on the 600?W setting and increase the power setting until the circuit breaker trips.

Part A

What power setting caused the breaker to trip?

What power setting caused the breaker to trip? A.) 600 W B.) 900 W C.) 1200 W D.) 1500 W

Explanation / Answer

B)

900 W is the answer

Total Power that can safely be used without breaker to trip

P=VI=120*20=2400 Watts

Now When hair dryer set to 900 Watts operated in parallel to electric heater ,then it equals to the total power and breaker will trip

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