Physics · Oct / Nov 2016 · Paper 12 · Question 16

Which expression gives the efficiency of an a.c. generator?

1. A\frac{\text{electrical energy output}}{\text{total energy input}}
2. B\frac{\text{electrical energy output}}{\text{thermal energy output}}
3. C\frac{\text{total energy output}}{\text{electrical energy input}}
4. D\frac{\text{thermal energy output}}{\text{total energy input}}

As printed in the paper