A-LevelPhysicsWork, energy and powerMay/June 2015Paper 1 Q181 Mark
Water from a reservoir is fed to the turbine of a hydroelectric system at a rate of 500 kg s⁻¹. The reservoir is 300 m above the level of the turbine. The electrical output from the generator driven by the turbine is 200 A at a potential difference of 6000 V. What is the efficiency of the system?
A8.0%
B8.2%
C80%
D82%
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The correct answer is D. 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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