Physics (AS & A Level) · May / June 2016 · Paper 13 · Question 19

The diagram shows the design of a water wheel which drives a generator to produce electrical power. The flow rate of the water is 200 kg s⁻¹. The generator supplies a current of 32 A at a voltage of 230 V. Ignoring any changes in kinetic energy of the water, what is the efficiency of the system?

1. A14%
2. B16%
3. C22%
4. D47%

As printed in the paper