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calculate the efficiency of a light bulb that had an input of 400 j transfers 100j as a light and 300j as heat.​
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calculate the efficiency of a light bulb that had an input of 400 j transfers 100j as a light and 300j as heat.​

User SammyT
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Efficiency = useful energy out / total energy in x 100
= 100/400 x 100
=0.25 x 100
= 25%

25%
User LostInComputer
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