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AP® Physics 1 & 2

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Difficult

Two Places for Voltmeter

APPH12-B3JXZ1

A student wants to find the internal resistance of a 9.0-volt battery. The student has connected the battery to a switch, and a single load resistor of 470 ohms, as shown in the diagram. The student also has a voltmeter to make measurements of potential difference.

What two measurements should the student make with the voltmeter so they have enough information to calculate the internal resistance?

Select TWO answers.

A

The potential difference across points $A$ and $B$ when the switch is open.

B

The potential difference across the points $A$ and $B$ when the switch is closed.

C

The potential difference across points $C$ and $D$ when the switch is open.

D

The potential difference across points $C$ and $D$ when the switch is closed.