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Why is efficiency less than 1?

Updated: 4/28/2022
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12y ago

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The Law of Conservation of Energy states that energy can't be created or destroyed. Thus, efficiency is 1 (i.e., 100%) if there is a perfect energy conversion. Since this is usually not the case, and some energy is wasted, the efficiency of most energy conversions is less than 100% (or less than a factor of 1).

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Q: Why is efficiency less than 1?
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