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

Which of the following 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.

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