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Energy efficiency may refer to: *
Energy efficiency (physics) Energy conversion efficiency (''η'') is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radia ...
, the ratio between the useful output and input of an energy conversion process **
Electrical efficiency The efficiency of a system in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression), typically denoted by the Greek small letter eta (η – ήτα). : ...
, useful power output per electrical power consumed **
Mechanical efficiency In mechanical engineering, mechanical efficiency is a dimensionless number that measures the effectiveness of a mechanism or machine in transforming the power input to the device to power output. A machine is a mechanical linkage in which forc ...
, a ratio of the measured performance to the performance of an ideal machine **
Thermal efficiency In thermodynamics, the thermal efficiency (\eta_) is a dimensionless performance measure of a device that uses thermal energy, such as an internal combustion engine, steam turbine, steam engine, boiler, furnace, refrigerator, ACs etc. For a h ...
, the extent to which the energy added by heat is converted to net work output or vice versa **
Luminous efficiency Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either th ...
, a measure of how well a light source produces visible light **
Fuel efficiency Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work. Overall fuel efficiency may vary per device, w ...
, the efficiency of converting potential energy in a fuel into kinetic energy **
Energy efficiency in transportation The energy efficiency in transport is the useful travelled distance, of passengers, goods or any type of load; divided by the total energy put into the transport propulsion means. The energy input might be rendered in several different types depe ...
, the fuel economy of various modes of transportation **
Energy-efficient landscaping Energy-efficient landscaping is a type of landscaping designed for the purpose of conserving energy. There is a distinction between the embedded energy of materials and constructing the landscape, and the energy consumed by the maintenance and ope ...
, a type of landscaping designed for the purpose of conserving energy *
Efficient energy use Efficient energy use, sometimes simply called energy efficiency, is the process of reducing the amount of energy required to provide products and services. For example, insulating a building allows it to use less heating and cooling energy to ...
, minimizing the amount of energy used for a given, constant energy service *
Energy conservation Energy conservation is the effort to reduce wasteful energy consumption by using fewer energy services. This can be done by using energy more effectively (using less energy for continuous service) or changing one's behavior to use less service (f ...
, reducing energy consumption by using less of an energy service


See also

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Energy (disambiguation) In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy may also refer to: Science and philosophy * Energy (Aristotle), "actuality" in Aristotelian philos ...
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Efficiency (disambiguation) Efficiency is the extent to which time or effort is well used for the intended task or purpose. Efficiency may also refer to: * Efficiency (aerodynamics), the amount of lift divided by the aerodynamic drag * Efficiency (apartment), a one-room ...
* Energy rating (disambiguation) * * {{Disambiguation