Why is it impossible to build a machine that produces more energy than it uses?

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  1. Because there is no such thing as perpetual motion. Another way to say it is that the effeciency would need to be greater than 100% and that can't be.

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  2. Efficiency can never reach 100% because there's always loss of energy during the process of carrying out work. One example is energy loss because they're converted into heat while operating.

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