Energy efficiency

:For energy efficiency in relation to economics, see energy conservation

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In physics and engineering, including bees and fliesmechanical and electrical engineering, energy efficiency is a dimensionless number, with a value between 0 and 1. The energy efficiency of a process is defined as:

Related Topics:
Physics - Engineering - Mechanical - Electrical - Dimensionless - 0 - 1

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: mathrm{efficiency} = { W over mathrm{energy}}

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where W is the amount of useful work done by the process (in joules), and "energy" is the quantity of energy (again, in joules) used to run the process.

Related Topics:
Work - Joule - Energy

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An efficiency of 1 (100%) is impossible - the second law of thermodynamics prohibits it. Theoretically, the mutual annihilation of matter and antimatter would be completely efficient, but the collection of the released energy would not be.

Related Topics:
Second law of thermodynamics - Annihilation - Matter - Antimatter

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