Category: Disambiguation In physics and engineering, including mechanical and electrical engineering, energy efficiency is a dimensionless number, with a value between 0 and 1 or with times 100 given in percent. ... Energy conversion efficiency is the ratio between the useful output of an energy conversion machine and the input, in energy terms. ... For the physical concepts, see conservation of energy and energy efficiency. ... The efficiency of an entity (a device, component, or system) in electronics and electrical engineering is defined as useful power output divided by the total electrical power consumed (a fractional expression). ... Fuel efficiency sometimes means the same as thermal efficiency, that is, the efficiency of converting energy contained in a carrier fuel to kinetic energy or work. ... The specific impulse (commonly abbreviated Isp) of a propulsion system is the impulse (change in momentum) per unit mass of propellant. ... 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. ... Lighting efficiency is a measure of how much visible light is given off from a light source per unit of energy. ... In physics, mechanical efficiency is the effectiveness of a machine and is defined as Efficiency is often indicated by a percentage, the efficiency of an ideal machine is 100%. Due to the fact that energy cannot emerge from nothing and the Second law of thermodynamics which states that the quality... Thermodynamic efficiency (e) is defined as: where W is the absolute value of the work done in one thermodynamic cycle. ... Exergy efficiency is also called second-law efficiency because it computes the efficiency of a process taking the second law of thermodynamics into account. ... The thermal efficiency () is a dimensionless performance measure of a thermal device such as an internal combustion engine, a boiler, or a furnace, for example. ... In aerodynamics, the lift-to-drag ratio, or L/D ratio (ell-over-dee, as opposed to ell-dee in the US, ell-dee in the UK), is the amount of lift generated by a wing, compared to the drag it creates by moving through the air. ... Economic efficiency is a general term for the value assigned to a situation by some measure designed to capture the amount of waste or friction or other undesirable economic features present. ... Pareto efficiency, or Pareto optimality, is an important notion in neoclassical economics with broad applications in game theory, engineering and the social sciences. ... Kaldor-Hicks efficiency is a type of economic efficiency that occurs only if the economic value of social resources is maximized. ... Allocative efficiency is the market condition whereby resources are allocated in a way that maximises the net benefit attained through their use. ... A social welfare function, in welfare economics, is a function which gives a measure of the material welfare of society, given a number of economic variables as inputs. ... 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 of a business is expenses as a percentage of revenue (expenses / revenue) with a few variations. ... 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, or wastes more or less of a given material compared to some standard. ... In computer science, efficiency is used to describe several desirable properties of an algorithm or other construct, besides clean design, functionality, etc. ... A graph showing variation of quantum efficiency with wavelength of the CCD chips in the Hubble Space Telescopes Wide Field and Planetary Camera 2. ... Image File history File links Disambig_gray. ...