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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
IntermediateMCQConceptual15.9k
A schematic circuit diagram containing an ideal DC voltage source labeled \varepsilon on the left vertical wire with its positive terminal at the top. The top horizontal wire connects to a resistor labeled R_1. To the right of R_1, the wire splits into a parallel branch containing resistor R_2 on the left and a circle with a capital V inside representing a voltmeter on the right. The bottom wire connects the parallel branch back to the negative terminal of the voltage source. No other labels, lines, text, or axes appear.
Circuit setup with a voltmeter connected across resistor R2.
A circuit consists of an ideal battery of potential difference \(\varepsilon\) connected in series with two resistors, \(R_1\) and \(R_2\). A student uses a non-ideal voltmeter with a finite internal resistance \(R_V\) to measure the potential difference across resistor \(R_2\). How does the measured voltage \(V_{\text{meas}}\) compare to the true voltage \(V_{\text{true}}\) across \(R_2\) before the voltmeter was connected, and why?

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