A-LevelPhysicsWork, energy and powerOct/Nov 2009Paper 1 Q151 Mark
An electric railway locomotive has a maximum mechanical output power of 4.0 MW. Electrical power is delivered at 25 kV from overhead wires. The overall efficiency of the locomotive in converting electrical power to mechanical power is 80%. What is the current from the overhead wires when the locomotive is operating at its maximum power?
A130 A
B160 A
C200 A
D250 A
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The correct answer is C. 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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