Physics (AS & A Level) · Oct / Nov 2021 · Paper 13 · Question 34

A cell has an electromotive force (e.m.f.) of 6 V and internal resistance R. An external resistor, also of resistance R, is connected across this cell, as shown. [diagram: cell with 6 V source and internal resistance R, connected to external resistor R] Power P is dissipated by the external resistor. The cell is replaced by a different cell that has an e.m.f. of 6 V and negligible internal resistance. What is the new power that is dissipated in the external resistor?

1. A0.5P
2. BP
3. C2P
4. D4P

As printed in the paper