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A boiler has an input energy of 720kJ from the gas it burns - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 1
Question 5
A boiler has an input energy of 720kJ from the gas it burns. It transfers 540kJ of useful energy to the home. What is the efficiency of the boiler? Use the equati... show full transcript
Worked Solution & Example Answer:A boiler has an input energy of 720kJ from the gas it burns - OCR Gateway - GCSE Physics - Question 5 - 2019 - Paper 1
Step 1
What is the efficiency of the boiler?
Answer
To find the efficiency of the boiler, we will use the formula:
efficiency = \frac{useful\ output\ energy\ transfer}{total\ input\ energy\ transfer}\Given:
- Useful output energy transfer = 540 kJ
- Total input energy transfer = 720 kJ
Now, substituting these values into the formula:
efficiency = \frac{540\ kJ}{720\ kJ} = 0.75\Therefore, the efficiency of the boiler is 0.75, which corresponds to option B.