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 2000 J Useful energy output 160 J Wasted energy Calculate the amount of wasted energy. Calculate the efficiency of the steam engine. Use the equation efficiency = (useful energy transferred by the steam engine) / (total energy supplied to the steam engine)

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

Question 2

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 find the wasted energy, we use the formula:

ext{wasted energy} = ext{Total energy input} - ext{Useful energy output}

Substituting the values:

ext{wasted energy} = 2000 ext{ J} - 160 ext{ J} = 1840 ext{ J}

Thus, the amount of wasted energy is 1840 J.

Step 2

Calculate the efficiency of the steam engine.

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Answer

The efficiency can be calculated using the formula:

ext{efficiency} = \frac{\text{useful energy transferred by the steam engine}}{\text{total energy supplied to the steam engine}}\times 100

Substituting the known values:

\text{efficiency} = \frac{160 ext{ J}}{2000 ext{ J}} \times 100 = 8\%

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

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