A train is powered by a diesel engine - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1
Question 2
A train is powered by a diesel engine.
The diesel engine is used to turn a generator.
The generator provides electricity for electric motors which drive the wheels.
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Worked Solution & Example Answer:A train is powered by a diesel engine - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1
Step 1
Draw one straight line from each train part to its useful energy transfer.
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Answer
Diesel engine: Chemical to electrical
Generator: Electrical to kinetic
Motor: Kinetic to chemical or Kinetic to electrical
Step 2
Calculate the amount of energy wasted in one second in the generator.
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Answer
Energy wasted = Energy supplied - Useful energy
Energy wasted = 1400 kJ - 1300 kJ = 100 kJ
Step 3
Calculate the efficiency of the generator.
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Answer
Efficiency = (Useful energy / Energy supplied) × 100
