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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
BeginnerMCQConceptual23.9k
A single-loop DC circuit schematic with an ideal battery on the left vertical branch, oriented positive terminal up. The circuit extends to a top horizontal wire containing Resistor 1. The right vertical branch contains Resistor 2. Connected in parallel across Resistor 2 on the far right is a voltmeter represented by a circle with a capital letter V inside. Wires connect smoothly forming a closed rectangular loop with the voltmeter forming an additional parallel branch on the right. No other components or labels appear.
Circuit schematic with a voltmeter connected across Resistor 2.
A student constructs a circuit consisting of an ideal battery connected in series with two resistors, designated as Resistor \(1\) and Resistor \(2\). To measure the potential difference across Resistor \(2\), the student connects a voltmeter in parallel across Resistor \(2\). The student observes that connecting the voltmeter does not noticeably change the current measured anywhere else in the circuit. Which of the following best explains why the current in the circuit remains unchanged?

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