Physics (AS & A Level) · May / June 2020 · Paper 12 · Question 36

A cell of electromotive force (e.m.f.) E and internal resistance 0.50 Ω is connected to a resistor of resistance 4.7 Ω. The maximum power that can be dissipated by the resistor without overheating is 0.50 W. What is the maximum value of E for the resistor not to overheat?

1. A1.4 V
2. B1.5 V
3. C1.7 V
4. D2.9 V

As printed in the paper