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Thea uses a hairdryer to dry her hair. The hairdryer has an efficiency of 0.5 and the total input energy is 180 kJ. How much of the energy supplied is wasted? Give your answer in joules

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raphealnwobi

90kJ of the energy supplied to the hair dryer is wasted.

Efficiency is the ratio of output to input. It is given by:

Efficiency = output / input

Given an efficiency of 0.5 and the total input energy is 180 kJ. Hence:

Efficiency = output / input

0.5 = output / 180 kJ

Output = 90 kJ

Amount of wasted energy = Input - output = 180kJ - 90kJ = 90kJ

Therefore 90kJ of the energy supplied is wasted.

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