Physics (AS & A Level) · May / June 2023 · Paper 12 · Question 15
A steam turbine is used to drive a generator. The input power to the turbine is P_I and the output power is P_O. The power loss in the turbine is P_L, as shown. [diagram: input power P_I -> turbine -> output power P_O -> generator; power loss P_L downward from turbine] What is the efficiency of the turbine?
- A\frac{P_L}{P_O}
- B\frac{P_I}{P_O}
- C\frac{P_L}{P_I}
- D\frac{P_O}{P_I}
As printed in the paper
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Correct answer: D. \frac{P_O}{P_I}
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