An electric heater is rated at 300 W when used in a 110-V circuit. The safety fuse in the circuit can handle 15 A of current. How many heaters can be safely operated in the circuit?
A) 5
B) 3
C) 4
D) 2
E) more than 5

Question

Quizplus · Accepted Answer

The current drawn by one heater is calculated using the formula P = VI, where P is power, V is voltage, and I is current. For one heater, I = P/V = 300W/110V = 2.73A. The total current for multiple heaters should not exceed 15A. Therefore, 15A / 2.73A per heater ≈ 5.49, meaning 5 heaters can be safely operated.

An Electric Heater Is Rated at 300 W When Used