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Asked by Hailey

A petrol engine takes 1000J of chemical energy and does 250J ofwork. What is the efficiency?

Hi Hailey, The efficiency is calculated by dividing the work done by the energy put in and then multiplying by 100% to make it into a percentage. It is essentially working out how much of the energy that is put in is actually used for work (useful energy). So, here the answer would be (250J/1000J) x 100% = 25%. Hope this helps!

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