Physics (AS & A Level) · May / June 2025 · Paper 14 · Question 33

A cell of constant electromotive force (e.m.f.) and negligible internal resistance is separately connected into four different circuits. In which circuit does the power dissipated by the lamp stay the same as the variable resistor is adjusted?

1. ACircuit A
2. BCircuit B
3. CCircuit C
4. DCircuit D

As printed in the paper