Physics (AS & A Level) · Oct / Nov 2017 · Paper 21 · Question 5

Three cells of electromotive forces (e.m.f.) E1, E2 and E3 are connected into a circuit, as shown in Fig. 5.1. X Y W Z I3 I2 I1 E3 E2 E1 R4 R1 R3 R2 Fig. 5.1 The circuit contains resistors of resistances R1, R2, R3 and R4. The currents in the different parts of the circuit are I1, I2 and I3. The cells have negligible internal resistance. Use Kirchhoff’s laws to state an equation relating

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