In the figure below, R1 = 120 ohm, R2 = 35 ohm, and the ideal batteries have emf

Question

In the figure below, R1 = 120 ohm, R2 = 35 ohm, and the ideal batteries have emfs f1 = 8.0 V, f2 = 5.5 V, f3 = 2.0 V. Find the current in resistor 1. Find the current in resistor 2. Find the potential difference between points a and b. Do you see that there are three loops to choose from? Which one should you use to write a loop equation to get the current through R1? Do you see that a wise choice gives you the current immediately? How about the current through R2? Do you also see that you do not need to know the current through any of the batteries because the potential difference across an ideal battery is set by the emf, not the current?

Explanation / Answer

8-7.5-iR2 = 0 i=0.5/35 = 0.014

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