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AP Physics 2
11.7 Kirchhoff’s Junction Rule
11.5 Compound Direct Current (DC) Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
IntermediateMCQProportional AnalysisConceptual14.9k
A schematic circuit diagram oriented horizontally. On the far left, a vertical DC battery symbol is labeled with potential difference \(\Delta V\), with the longer positive terminal line on top. Extending from the top and bottom terminals of the battery are horizontal wire lines forming a parallel network. Three vertical parallel branches connect the top horizontal wire to the bottom horizontal wire. The leftmost vertical branch contains a resistor labeled \(R_1\). The middle vertical branch contains a resistor labeled \(R_2\). The rightmost vertical branch contains an open switch labeled \(S\) in series with a resistor labeled \(R_3\). No other labels, lines, text, or axes appear.
Circuit diagram before switch S is closed.
A circuit contains an ideal battery of constant potential difference \(\Delta V\) connected across two parallel resistors, \(R_1\) and \(R_2\). A switch is then closed to connect a third resistor, \(R_3\), in parallel with \(R_1\) and \(R_2\). Which of the following correctly predicts the change in the total current supplied by the battery and provides the correct physical justification?

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