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AP® Physics 1 & 2

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Replacing Batteries: Explain Circuit Differences

APPH12-O9GZKW

A student connects a small light bulb to a fresh, 1.63-volt, AA-battery. With the fresh battery the light bulb glows brightly. The student then replaces the original battery with an older, 1.1-volt, AA-battery. With the older battery, the light bulb glows dimly.

What explanation below correctly summarizes the adjustments made to the circuit?

A

Changing the battery increased the light bulb’s resistance. The lower resistance allowed for less current to flow through the light bulb.

B

Changing the battery decreased the light bulb’s resistance. The increased resistance allowed for more current to flow through the light bulb.

C

Changing the battery did not affect the light bulb’s resistance. The decreased brightness resulted from a decrease in current through the bulb.

D

Changing the battery did not change the light bulb’s resistance. The decreased brightness resulted from an increase in current through the bulb.