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16 October, 07:44

A laptop can convert 400J of electrical energy into a 240J of light and sound. What is the efficiency? Where does the rest of the energy go?

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  1. 16 October, 09:01
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    Efficiency = (Wanted) energy out : energy in * 100

    Energy in = 400J

    Wanted Energy out = 240J

    Energy cannot be used up, only transferred, so the remaining energy is most likely to be transferred into unwanted energy (loss of energy) such as heat energy.

    Efficiency = 240 : 400 * 100

    Efficiency = 0.6 * 100

    Efficiency = 60%
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