Physics (AS & A Level) · Feb / March 2025 · Paper 12 · Question 17

A turbine at a hydroelectric power station is situated at a vertical distance of 30 m below the level of the surface of a large lake. The water passes through the turbine at a rate of 340 m³ per minute. The overall efficiency of the turbine and generator system is 90%. The density of water is 1000 kg m⁻³. What is the useful power output of the power station?

1. A0.15 MW
2. B1.5 MW
3. C1.7 MW
4. D90 MW

As printed in the paper