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Figure 2 shows an energy transfer diagram for a steam engine - Edexcel - GCSE Physics - Question 2 - 2019 - Paper 1

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Figure 2 shows an energy transfer diagram for a steam engine. The diagram shows the amounts of energy transferred each second by the steam engine. Energy input 200... show full transcript

Worked Solution & Example Answer:Figure 2 shows an energy transfer diagram for a steam engine - Edexcel - GCSE Physics - Question 2 - 2019 - Paper 1

Step 1

Calculate the amount of wasted energy.

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Answer

To calculate the wasted energy, we subtract the useful energy output from the total energy input:

wasted energy=energy input−useful energy output\text{wasted energy} = \text{energy input} - \text{useful energy output}

Substituting the known values: wasted energy=2000 J−160 J=1840 J\text{wasted energy} = 2000 \text{ J} - 160 \text{ J} = 1840 \text{ J}

Thus, the amount of wasted energy is 1840 J.

Step 2

Calculate the efficiency of the steam engine.

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Answer

Efficiency can be calculated using the formula:

efficiency=useful energy transferred by the steam enginetotal energy supplied to the steam engine\text{efficiency} = \frac{\text{useful energy transferred by the steam engine}}{\text{total energy supplied to the steam engine}}

Substituting in the given values: efficiency=160 J2000 J\text{efficiency} = \frac{160 \text{ J}}{2000 \text{ J}}

Calculating the efficiency: efficiency=0.08\text{efficiency} = 0.08

To express this as a percentage, multiply by 100: efficiency=0.08×100=8%\text{efficiency} = 0.08 \times 100 = 8\%

Therefore, the efficiency of the steam engine is 8%.

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