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Why can a device never be 100% efficient? Explain.
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Why can a device never be 100% efficient? Explain.

User William Swanson
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Answer:The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.

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User Salman Ullah Khan
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Answer:

No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible.

User Jeff Deskins
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