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

Question 2

(a) 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 whee... show full transcript

Worked Solution & Example Answer:(a) 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
Motor --> Kinetic to Electrical

Step 2

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

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Answer

Energy wasted can be calculated using the formula:

$\text{Energy wasted} = \text{Energy supplied} - \text{Useful energy}$

Substituting the known values:

$\text{Energy wasted} = 1400 \text{ kJ} - 1300 \text{ kJ} = 100 \text{ kJ}$

Step 3

Calculate the efficiency of the generator.

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Answer

The efficiency can be calculated using the formula:

$\text{Efficiency} = \left( \frac{\text{Useful energy}}{\text{Energy supplied}} \right) \times 100$

Substituting the known values:

$\text{Efficiency} = \left( \frac{1300}{1400} \right) \times 100 = 93\%$

Step 4

Suggest why the motors are painted black.

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Answer

The motors are painted black because black is a good thermal radiator, helping to remove wasted energy or heat from the motors, thus preventing them from overheating.

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Questions answered

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

Worked Solution & Example Answer:(a) 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.

Join the GCSE students using SimpleStudy...

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