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10 June, 23:32

How is the mechanical efficiency of a machine usually expressed 1. As a fraction 2. As a percentage 3. As inches or feet 4. As one of three classes

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  1. 11 June, 02:52
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    The efficiency of any contraption that uses energy to

    do a job is defined as

    (amount of useful energy output) / (amount of energy input).

    In describing or talking about the efficiency f the machine,

    it's most often expressed as a percentage.

    It's important to notice that the output is taken to be the useful output.

    Why is that important?

    Here's a simple example:

    If you use an incandescent light bulb as a source of light, then

    the useful output is the light, and its efficiency is quite low.

    If you use an incandescent light bulb as a source of heat, then

    the useful output is the heat, and its efficiency is quite high.
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