The next two questions refer to the circuit shown, which contains two batteries.

Question

The next two questions refer to the circuit shown, which contains two batteries. Please note carefully the polarities of the batteries. The directions of the currents in the three resistors have been chosen as shown. Which of the following equations is the correct current equation, given the choice of current directions? I1 + 12 = I3 I2+I3 = I1 I3 + I1 = I2 None of these. Which one of the following equations is correct, given the choice of current directions? (Only one is correct.) V1 - V2 + I2R2 + I3R3 = 0 V2 - I2R2 - I3R3 = 0 V1 + I1R1 + I3R3 = 0 V1 - V2 - I1,R1 - I3R3 = 0 V1 + I1IR - I3R3 = 0

Explanation / Answer

9.

A. I3=I2+I1

10.

V2-I3R3-I2R2=0

Hence B

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