Energy efficiency
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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