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. (i) Draw one straight line from each train part to its useful energy transfer. train part useful energy transfer diesel engine chemical to electrical generator electrical to kinetic motor kinetic to chemical kinetic to electrical (b) The diagram represents the energy transfer in one second in the generator. energy supplied = 1400 kJ useful energy = 1300 kJ (i) Calculate the amount of energy wasted in one second in the generator. (ii) Calculate the efficiency of the generator. (c) The electric motors which drive the wheels are painted black. Suggest why the motors are painted black.

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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. ... show full transcript

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

Efficiency = (1300 kJ / 1400 kJ) × 100 = 92.86% (approximately 93%)

Step 4

Suggest why the motors are painted black.

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Answer

Black is a good thermal radiator, helping to remove waste heat from the motor.

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Questions answered

A train is powered by a diesel engine - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1

Worked Solution & Example Answer:A train is powered by a diesel engine - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1

Draw one straight line from each train part to its useful energy transfer.

Calculate the amount of energy wasted in one second in the generator.

Calculate the efficiency of the generator.

Suggest why the motors are painted black.

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