Efficiency facts for kids

Kids Encyclopedia Facts

Efficiency could mean:

  • 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
    • Volumetric efficiency, in internal combustion engine design
    • Lighting efficiency, visible light from a light source per unit of power, 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



Efficiency Facts for Kids. Kiddle Encyclopedia.