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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
BeginnerMCQConceptual23.5k
A schematic diagram of a rectangular direct-current circuit. On the left vertical wire, a battery symbol is shown, labeled \(\mathcal{E}\). On the top horizontal wire, a fixed resistor is labeled \(R_1\). On the right vertical wire, a second fixed resistor is labeled \(R_2\). Two wire leads branch off from above and below resistor \(R_2\) to connect in parallel with a circle containing the uppercase letter \(V\). The bottom horizontal wire connects the right vertical wire back to the negative terminal of the battery. No other labels, lines, meters, or text appear.
Circuit diagram showing a voltmeter connected across resistor \(R_2\).
A student uses a voltmeter to measure the potential difference across a resistor in an operating DC circuit. Which of the following statements correctly identifies the desired internal resistance of an ideal voltmeter and provides the correct physical justification?

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