Energy efficiency: Difference between revisions

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Energy efficiency may refer to:

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

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-:''For energy efficiency in relation to economics, see [[energy conservation]]''
+'''Energy efficiency''' may refer to:
+* [[Energy efficiency (physics)]], the ratio between the useful output and input of an energy conversion process
-In [[physics]] and [[engineering]], including [[mechanical engineering|mechanical]] and [[electrical engineering|electrical]] engineering, '''energy efficiency''' is a [[dimensionless]] number, with a value between [[0 (number)|0]] and [[1 (number)|1]] or, when multiplied by 100, is given as a percentage.  The energy efficiency of a process, denoted by [[Eta (letter) | eta]], is defined as
+** [[Electrical efficiency]], useful power output per electrical power consumed
-:<math>
+** [[Mechanical efficiency]], a ratio of the measured performance to the performance of an ideal machine
-\mathrm{efficiency} \ \eta = \mathrm{{power \ output} \over \mathrm{power \ input}} \ (= \frac{\text{work} \  W }{ \text{energy} \  E}) \,
+** [[Thermal efficiency]], the extent to which the energy added by heat is converted to net work output or vice versa
-</math>
+** [[Luminous efficiency]], a measure of how well a light source produces visible light
+** [[Fuel efficiency]], the efficiency of converting potential energy in a fuel into kinetic energy
-where ''W'' is the amount of useful [[mechanical work|work]] done by the process (in [[joule]]s), and "energy" ''E'' is the quantity of [[energy]] (again, in joules) used to run the process.
+** [[Energy efficiency in transportation]], the fuel economy of various modes of transportation
+** [[Energy-efficient landscaping]], a type of landscaping designed for the purpose of conserving energy
-Due to the principle of conservation of energy, energy efficiency within a closed system can never exceed 100%.
+* [[Efficient energy use]], minimizing the amount of energy used for a given, constant energy service
+* [[Energy conservation]], reducing energy consumption by using less of an energy service
 ==See also==
-*[[Energy conversion efficiency]]
+* [[Energy (disambiguation)]]
+* [[Efficiency (disambiguation)]]
-*[[Fuel efficiency]]
+* [[Energy rating (disambiguation)]]
-*[[Thermal efficiency]]
+* {{intitle}}
-*[[Sensitivity (electronics)]]
+* {{intitle|Energy efficient}}
-*[[Figure of merit]]
-*[[Exergy efficiency]]
-==External links==
-*[http://www.sengpielaudio.com/calculator-efficiency Conversion of sensitivity in dB per Watt and meter to energy efficiency in percent for passive loudspeakers]
+{{Disambiguation}}
-[[Category:Introductory physics]]
-[[Category:Building engineering]]
-[[Category:Figures of merit]]
+[[Category:Energy efficiency]]
-[[cs:Účinnost]]
-[[da:Virkningsgrad]]
-[[de:Wirkungsgrad]]
-[[fr:Efficacité énergétique]]
-[[lt:Naudingumo koeficientas]]
-[[no:Virkningsgrad]]
-[[pl:Sprawność]]
-[[ru:Коэффициент полезного действия]]
-[[sl:Izkoristek]]
-[[uk:Коефіцієнт корисної дії]]