Physics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 34

Three cells with e.m.f.s $V_1$, $V_2$ and $V_3$, have negligible internal resistance. These cells are connected to three resistors with resistances $R_1$, $R_2$ and $R_3$, as shown. The current in the circuit is $I$. Which equation is correct?

1. A$V_1 + V_2 + V_3 = I(R_1 + R_2 + R_3)$
2. B$V_1 + V_2 - V_3 = I(R_1 + R_2 + R_3)$
3. C$V_1 - V_2 + V_3 = I(R_1 + R_2 + R_3)$
4. D$V_1 - V_2 - V_3 = I(R_1 + R_2 + R_3)$

As printed in the paper