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That means that some energy is wasted. For example, it is quite common for part of the input energy to be converted into useless heat.

A drastic example is a traditional incandescent light bulb. Something like 5% of the energy gets converted into visible light. The remainder is radiated mainly as infrared - that is, heat radiation.

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Q: What causes the efficency of a machine to be less than 100 percent?
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