Physics (AS & A Level) · May / June 2019 · Paper 11 · Question 35

When a battery is connected to a resistor, the battery gradually becomes warm. This causes the internal resistance of the battery to increase whilst its electromotive force (e.m.f.) stays unchanged. As the internal resistance of the battery increases, how do the terminal potential difference and the output power change, if at all?

1. Aterminal potential difference decreases; output power decreases
2. Bterminal potential difference decreases; output power unchanged
3. Cterminal potential difference unchanged; output power decreases
4. Dterminal potential difference unchanged; output power unchanged

As printed in the paper