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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
11.4 Electric Power
11.3 Resistance, Resistivity, and Ohm’s Law
AdvancedMCQProportional AnalysisConceptual16.9k
A rectangular circuit diagram oriented horizontally. On the far left vertical branch, an ideal battery is drawn with long positive terminal line on top labeled \(V_0\) and short negative terminal line on bottom. From the top of the battery, a horizontal wire goes right through resistor \(R_1\) to junction A. From junction A, the path splits into two parallel vertical branches that rejoin at junction B below. The left parallel branch contains resistor \(R_2\). The right parallel branch contains resistor \(R_3\) in series with an open switch labeled \(S\). From junction B, a horizontal wire returns left to the bottom negative terminal of the battery. No other components, lines, text, or axes appear.
Circuit schematic with resistors R1, R2, R3 and switch S.
A circuit consists of an ideal battery of potential difference \(V_0\), three identical resistors each of resistance \(R\), and an open switch \(S\), as shown in the diagram. Resistors \(R_1\) and \(R_2\) are connected in series across the battery, while resistor \(R_3\) and switch \(S\) form a branch connected in parallel across \(R_2\). What is the ratio \(P_f / P_i\) of the rate of energy dissipation in resistor \(R_1\) after switch \(S\) is closed to the rate of energy dissipation in resistor \(R_1\) before switch \(S\) is closed?

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