Physics · Oct / Nov 2021 · Paper 12 · Question 13

Which equation is used to find the efficiency of an energy transfer?

1. Aefficiency = useful energy output / total energy input
2. Befficiency = total energy input / useful energy output
3. Cefficiency = energy converted to the required form / total power input
4. Defficiency = (energy converted to the required form) × (total energy input)

As printed in the paper