A certain 20-A circuit breaker trips when the current in it equals 20 A. What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker

28

Explanation:

Given

Circuit breaker current is

Power of the light bulb is

Voltage of the DC-circuit is

If the resistance are connected in parallel, they must have same voltage i.e. 120 V

So, Resistance is given by

For the 20 A current and 120 V battery, net resistance is

Suppose there are n resistance in the circuit connected in parallel.

Thus, there can maximum of 28 bulbs.

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