Mechanical efficiency
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In [[physics]], '''mechanical efficiency''' is the effectiveness of a machine and is defined as
:<math>\mbox{Efficiency} = \frac{\mathrm{Mechanical Advantage}}{\mathrm{Velocity Ratio}}</math>
To show the effectiveness of a machine one must compare its work input to its work output. Efficiency is often indicated by a [[percentage]], the efficiency of an [[ideal machine]] is 100%. Due to the fact that energy cannot emerge from nothing and the [[Second law of thermodynamics]] which states that the quality of energy will always decrease (transforming from mechanical energy to [[thermal energy]]) the mechanical efficiency of any machine will always be less than 100%. Additionally, there will always be some friction to hinder the machine's performance.
==See also==
*[[Thermal efficiency]]
*[[Electrical efficiency]]
*[[Internal combustion engine]]
*[[Electric motor]]
[[Category:Mechanical engineering]]
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[[he:נצילות מכנית]]
[[sk:Mechanická účinnosť]]