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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.
Answer
To find the wasted energy, subtract the useful energy output from the total energy input.
Wasted energy = Energy input - Useful energy output
Substituting the values we have:
Wasted energy = 2000 J - 160 J = 1840 J
Thus, the amount of wasted energy is 1840 J.
Step 2
Calculate the efficiency of the steam engine.
Answer
To calculate the efficiency, use the formula:
[ \text{efficiency} = \frac{\text{useful energy transferred by the steam engine}}{\text{total energy supplied to the steam engine}} ]
Substituting the values:
[ \text{efficiency} = \frac{160 \text{ J}}{2000 \text{ J}} = 0.08 \text{ or } 8% ]
Therefore, the efficiency of the steam engine is 8%.