A 1500 W hair dryer is run on a 120 V rms circuit.If the circuit breaker is chosen from breakers with the ratings below,which is the lowest-rated current breaker of the following 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

To determine the minimum rating of the circuit breaker required for the hair dryer, we can use the formula:

I = P/V

Where I is the current, P is the power, and V is the voltage. Plugging in the given values:

I = 1500 W / 120 V 
I = 12.5 A

Therefore, we need a circuit breaker with a rating of at least 12.5 A to avoid opening the circuit during operation.

The lowest-rated current breaker that won't open the circuit is 15 A (choice B), which is the closest option to the required 12.5 A. The other options (10A, 20A, 30A, 60A) are either too low or too high for safe operation.

A 1500 W Hair Dryer Is Run on a 120