Physics 2 Quiz
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A student reads a circuit diagram and identifies the following: a battery E=20 V\mathcal{E} = 20\ \text{V} (internal resistance negligible) drives current through an outer loop. The outer loop contains two nodes P and Q. Between P and Q there are three parallel branches: Branch 1 contains only resistor R1=10 ΩR_1 = 10\ \Omega; Branch 2 contains resistor R2=20 ΩR_2 = 20\ \Omega in series with another resistor R3=20 ΩR_3 = 20\ \Omega; Branch 3 contains an ideal current source Is=0.5 AI_s = 0.5\ \text{A} directed from Q to P (i.e., upward in the diagram). The battery is in a fourth branch, also between P and Q, with its positive terminal at P.
From the circuit diagram, a student must determine the conventional current through R1R_1. Which of the following is correct?
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