Efficiency

Look up efficiency in Wiktionary, the free dictionary.

Efficiency may refer to:

In science and technology

• Efficiency (statistics), a count of desirability of an estimator
• Algorithmic efficiency, optimizing the speed and memory requirements of a computer program
• Efficiency factor, in data communications

In economics

• Economic efficiency, a general term, capturing the amount of waste or other undesirable features
• Financial market efficiency, how efficient is the trading going on the financial markets
  • 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
  • Efficiency wages, paying workers more than the market rate for increased productivity
• Business efficiency, expenses as a percentage of revenue, etc.
• Efficiency Movement, of the Progressive Era (1890–1932), advocated efficiency in the economy, society and government

In physics

• Efficient energy use, 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
  • 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
  • In thermodynamics:
    • Exergy efficiency, measure of second law thermodynamic 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
  • Volumetric efficiency, in internal combustion engine design
• Lift-to-drag ratio
• Faraday Efficiency, electrolysis
• Quantum efficiency, a measure of sensitivity of a photosensitive device
• Grating efficiency, a generalization of the reflectance of a mirror, extended to a diffraction grating

Other uses

• Material efficiency, compares material requirements between construction projects or physical processes
• Efficient (horse), winner of the 2007 Melbourne Cup
• Studio apartment, a one-room apartment, also called an efficiency apartment
• Textual efficiency, the content density of a message

See also

• Inefficiency

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