A 1500 W hair dryer is run on a 120 V rms circuit. Which of the following is the lowest-rated current breaker that won't open the circuit?
A) 10 A
B) 15 A
C) 20 A
D) 30 A
E) 60 A

Question

Quizplus · Accepted Answer

The current drawn by the hair dryer can be calculated using the formula P = VI, where P is power (1500 W) and V is voltage (120 V). Rearranging the formula gives I = P/V = 1500W / 120V = 12.5 A. Therefore, the lowest-rated current breaker that won't open the circuit is 15 A, as it is the smallest rating that can handle the 12.5 A current without tripping.

A 1500 W Hair Dryer Is Run on a 120