'Efficiency' as a technical term may refer to:
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Energy efficiency, useful work per quantity of energy
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Energy conversion efficiency, desired energy output per energy input
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Energy conservation, reducing the use of energy
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Electrical efficiency, useful power output per electrical power consumed
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Fuel efficiency, converting energy in fuel to kinetic energy or work
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Specific impulse, in propulsion systems, a measure of fuel-efficiency
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Volumetric efficiency, in internal combustion engine design
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Lighting efficiency, visible light from a light source per unit of energy, in lumens per watt
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Mechanical efficiency, the effectiveness of a
simple machine, mechanical advantage over ideal mechanical advantage
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Thermodynamic efficiency, useful work per change in heat
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Exergy efficiency, measure of 2nd-law themodynamic loss
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Thermal efficiency, useful work per the higher heating value of the fuel
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Radiation efficiency, ratio of radiated power to power absorbed at the terminals of an antenna
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Efficiency (aerodynamics), for fixed wing aircraft the Lift-to-drag ratio
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Efficiency (economics), a general term, to capture the amount of waste or other undesirable features
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Pareto efficiency, making one individual better off, without making any other individual worse off
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Kaldor-Hicks efficiency, like a less stringent Pareto efficiency
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Allocative efficiency, an optimal distribution of goods
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★ The optimisation of a
social welfare function
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Efficiency wages, paying workers more than the market rate for increased productivity
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Efficiency (statistics), a measure of desirability of an estimator
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Efficiency ratio, expenses as a percentage of revenue, etc.
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Efficiency Movement, of the Progressive Era 1890-1932, advocated efficiency in the economy, society and government
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Material efficiency, compares material requirements between construction projects or physical processes
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Textual efficiency, density of a message
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Algorithmic efficiency, the speed and space requirements of a computer program
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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
See also
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Inefficiency