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Chapter 4: Q14DQ (page 873)

The battery in the circuit shown in Fig. Q26.14 has no internal resistance. After you close the switch S, will the brightness of bulbB1increase, decrease, or stay the same?

Short Answer

Expert verified

The brightness of B1 will increase.

Step by step solution

01

Determining the brightness of bulb B1

The two bulbs are in series while switch S is open, thus they have the same current but not the same voltage. The voltage drop in the battery is caused by their series combination.

When S is closed, the current flows only throughB1and the switch S, whileB2is cut off because the switch path creates a short circuit with no resistance and draws the current. As it only flows inB1, the current will increase as the total resistance in the circuit decreases.

Hence, the brightness of B1will increase.

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