A-LevelPhysicsWork, energy and powerFeb/Mar 2025Paper 1 Q171 Mark
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?
A0.15 MW
B1.5 MW
C1.7 MW
D90 MW
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The correct answer is B. This question tests the candidate's understanding of work, energy and power within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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