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.
- 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
- 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
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