# Energy efficiency

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> Source: https://en.wikipedia.org/wiki/Energy_efficiency
> Source revision: 1301968945
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'''Energy efficiency''' may refer to:

* [Energy efficiency (physics)](/source/Energy_efficiency_(physics)), the ratio between the useful output and input of an energy conversion process
** [Electrical efficiency](/source/Electrical_efficiency), useful power output per electrical power consumed
** [Mechanical efficiency](/source/Mechanical_efficiency), a ratio of the measured performance to the performance of an ideal machine 
** [Thermal efficiency](/source/Thermal_efficiency), the extent to which the energy added by heat is converted to net work output or vice versa
** [Luminous efficiency](/source/Luminous_efficiency), a measure of how well a light source produces visible light
** [Fuel efficiency](/source/Fuel_efficiency), the efficiency of converting potential energy in a fuel into kinetic energy
** [Energy efficiency in transportation](/source/Energy_efficiency_in_transportation), the fuel economy of various modes of transportation
** [Energy-efficient landscaping](/source/Energy-efficient_landscaping), a type of landscaping designed for the purpose of conserving energy
* [Efficient energy use](/source/Efficient_energy_use), minimizing the amount of energy used for a given, constant energy service
* [Energy conservation](/source/Energy_conservation), reducing energy consumption by using less of an energy service

==See also==
* [Energy (disambiguation)](/source/Energy_(disambiguation))
* [Efficiency (disambiguation)](/source/Efficiency_(disambiguation))
* [Energy rating (disambiguation)](/source/Energy_rating_(disambiguation))
* {{intitle}}
* {{intitle|Energy efficient}}

{{Disambiguation}}

Energy efficiency

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Adapted from the Wikipedia article [Energy efficiency](https://en.wikipedia.org/wiki/Energy_efficiency) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Energy_efficiency?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.