Physics (AS & A Level) · Oct / Nov 2021 · Paper 12 · Question 18

The energy conversions inside a power station burning fossil fuel can be simplified as shown. chemical energy W → thermal energy X → electrical energy Y Which expression gives the efficiency of the power station?

1. A\frac{Y}{W}
2. B\frac{Y}{(W+X)}
3. C\frac{Y}{X}
4. D\frac{Y}{(W+X+Y)}

As printed in the paper