Efficiency as a technical term may refer to:
- Energy efficiency, useful work per quantity of energy
- Energy conversion efficiency, desired energy output per energy input
- Energy conservation, reducing the use of energy
- Electrical efficiency, useful power output per electrical power consumed
- Fuel efficiency, converting energy in fuel to kinetic energy or work
- Specific impulse, in propulsion systems, a measure of fuel-efficiency
- Volumetric efficiency, in internal combustion engine design
- Lighting efficiency, visible light from a light source per unit of energy, in lumens per watt
- Mechanical efficiency, the effectiveness of a simple machine, mechanical advantage over ideal mechanical advantage
- Thermodynamic efficiency, useful work per change in heat
- Exergy efficiency, measure of 2nd-law themodynamic loss
- Thermal efficiency, useful work per the higher heating value of the fuel
- Radiation efficiency, ratio of radiated power to power absorbed at the terminals of an antenna
- Efficiency (aerodynamics), for fixed wing aircraft the Lift-to-drag ratio
- Efficiency (economics), a general term, to capture the amount of waste or other undesirable features
- Pareto efficiency, making one individual better off, without making any other individual worse off
- Kaldor-Hicks efficiency, like a less stringent Pareto efficiency
- Allocative efficiency, an optimal distribution of goods
- The optimisation of a social welfare function
- Efficiency wages, paying workers more than the market rate for increased productivity
- Efficiency (statistics), a measure of desirability of an estimator
- Efficiency ratio, expenses as a percentage of revenue, etc. Energy conversion efficiency is the Ratio between the useful output of an Energy conversion machine and the input in Energy terms Energy conservation is the practice of decreasing the quantity of energy used The efficiency of an entity (a device, component, or System) in Electronics and Electrical engineering is defined as useful Fuel efficiency, in its basic sense is the same as Thermal efficiency, meaning the efficiency of a process that converts chemical potential energy contained in a carrier Specific impulse (usually abbreviated I sp is a way to describe the efficiency of rocket and jet engines Volumetric efficiency in Internal combustion engine Design refers to the efficiency with which the engine can move the charge into and out of the cylinders Luminous efficacy is a property of Light sources which indicates what portion of the emitted Electromagnetic radiation is usable for human vision. In Physics, mechanical efficiency is the effectiveness of a machine and is defined as \text{Efficiency} = \frac{\text{Mechanical Advantage}}{\text{Velocity In Physics, especially Mechanics, a simple machine is a mechanical device that changes the direction or magnitude of a Force. In Thermodynamics, the thermal efficiency (\eta_{th} \ is a dimensionless performance measure of a thermal device such as an Internal combustion Exergy efficiency (also known as the second-law efficiency or rational efficiency) computes the efficiency of a process taking the second law of thermodynamics into In Thermodynamics, the thermal efficiency (\eta_{th} \ is a dimensionless performance measure of a thermal device such as an Internal combustion In Aerodynamics, the lift-to-drag ratio, or L/D ratio ("ell-over-dee" in the US "ell-dee" in the UK is the amount of lift generated Economic efficiency is used to refer to a number of related concepts Pareto efficiency, or Pareto optimality, is an important concept in Economics with broad applications in Game theory, Engineering and the Kaldor-Hicks efficiency (named for Nicholas Kaldor and John Hicks) is a measure of Economic efficiency that captures some of the intuitive appeal of Allocative efficiency is a situation in which the limited resources of a firm are allocated in accordance with the wishes of Consumers An allocatively efficient economy In economics a social welfare function can be defined as a real-valued function that ranks conceivable social states (alternative complete descriptions of the society In Labor economics, the efficiency wage hypothesis argues that wages at least in some markets are determined by more than simply Supply and demand. In Statistics, efficiency is one measure of desirability of an Estimator. The efficiency ratio
- Efficiency Movement, of the Progressive Era 1890-1932, advocated efficiency in the economy, society and government
- Material efficiency, compares material requirements between construction projects or physical processes
- Faraday Efficiency, electrolysis
- Textual efficiency, density of a message
- Algorithmic efficiency, the speed and space requirements of a computer program
- Quantum efficiency, a measure of sensitivity of a photosensitive device: the percentage of photons hitting the photoreactive surface that will produce an electron–hole pair
- Efficient (horse), winner of the 2007 Melbourne Cup. The Efficiency Movement was a major dimension of the Progressive Era in the United States Material efficiency is a description or metric which expresses the degree to which a construction project or physical process is carried out in a manner which consumes incorporates Faradic Efficiency (also called coulombic efficiency or current efficiency) describes the efficacy with which Current ( Electrons are transfered In Computer science, efficiency is used to describe properties of an Algorithm relating to how much of various types of resources it consumes Quantum efficiency (QE is a quantity defined for a photosensitive device such as Photographic film or a Charge-coupled device (CCD as the percentage of Photons Efficient (foaled 2003 is an Australian grey Thoroughbred Gelding racehorse bred in New Zealand, who won the 2007 Melbourne Cup,
- Efficiency apartment, a one room apartment, also called a Studio apartment
See also
A studio apartment ( studio flat in the United Kingdom) or an efficiency apartment or bachelor style apartment or Bachelorette The term inefficiency has several meanings depending on the context in which its used Allocative inefficiency - Allocative efficiency theoryDictionary
efficiency
-noun
- The extent to which time is well used for the intended task.
- The extent to which a resource, such as electricity, is used for the intended purpose.
- A one-room apartment.
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