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A boiler has an input energy of 720 kJ from the gas it burns - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 1

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A boiler has an input energy of 720 kJ from the gas it burns. It transfers 540 kJ of useful energy to the home. What is the efficiency of the boiler? Use the equa... show full transcript

Worked Solution & Example Answer:A boiler has an input energy of 720 kJ from the gas it burns - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 1

Step 1

What is the efficiency of the boiler?

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Answer

To calculate the efficiency of the boiler, we use the provided formula:

efficiency=useful output energy transfertotal input energy transferefficiency = \frac{useful\ output\ energy\ transfer}{total\ input\ energy\ transfer}

Here, the useful output energy transfer is 540 kJ, and the total input energy transfer is 720 kJ. Substituting these values into the formula:

efficiency=540 kJ720 kJ=0.75efficiency = \frac{540 \text{ kJ}}{720 \text{ kJ}} = 0.75

Thus, the efficiency of the boiler is 0.75, which corresponds to option B.

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