A certain 20-A circuit breaker trips when the current in it equals $20 \mathrm {~A}$. What is the maximum number of $100 - W$ light bulbs you can connect in parallel in an ideal $120 - \mathrm { V }$ dc circuit without tripping this circuit breaker?
A) 23
B) 11
C) 27
D) 17

Question

Quizplus · Accepted Answer

The maximum current the circuit can handle is 20 A. Each light bulb draws 100 W / 120 V = 5/6 A. So the maximum number of light bulbs is 20 A / (5/6 A) = 24.

A Certain 20-A Circuit Breaker Trips When the Current in It