Efficiency

Efficiency is the capability of acting or producing effectively with a minimum of waste, expense, or unnecessary effort. The term has widely variant meanings in different disciplines. See

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• Algorithmic efficiency for its use in computer science.
• efficiency is also a computer science term used when discussing parallel computing and speedup.
• Efficiency (economics) for its use in economics.
• Textual efficiency for its use in linguistics.
• Efficiency (statistics) for its use in statistics.
• Energy efficiency in physics, engineering, and energy management.
• Electrical efficiency for its use in electronics and electrical engineering.
• Fuel efficiency for its use in automobiles (also known as "gas mileage").
• Lighting efficiency for comparison of different electric light technologies.
• Mechanical efficiency for its use in engineering.
• Material efficiency for its use in engineering, design, and manufacturing
• In rocket propulsion, specific impulse is a measure of mass-efficiency, though a very high specific impulse is not energy-efficient
• Thermodynamic or "engine" efficiency for its use in Thermodynamics, Statistical Physics, related fields, and engines and motors.
• Volumetric efficiency for its use in engine design
• efficiency (fair division), for its use in fair division problems

In several of these cases, efficiency can be expressed as a result as percentage of what ideally could be expected, hence with 100% as ideal case. This does not always apply, not even in all cases where efficiency can be assigned a numerical value, e.g. not for specific impulse.

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A slightly broader model of efficiency that nevertheless remains consistent with the "percentage" definition in many cases is to say that efficiency corresponds to the ratio r=P/C of the amount P of some valuable resource produced, per amount C of valuable resources consumed. This may correspond to a percentage if products and consumables are quantified in compatible units, and if consumables are transformed into products via a conservative process. For example, in the analysis of the energy efficiency of heat engines in thermodynamics, the product P may be the amount of useful work output, while the consumable C is the amount of high-temperature heat input. Due to the conservation of energy, P can never be greater than C, and so the efficiency r is never greater than 100% (and in fact must be even less at finite temperatures).

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Energy efficiency: :For energy efficiency in relation to economics, see energy conservation...

Heat engines: REDIRECT heat engine...

Thermodynamics: Thermodynamics (Greek: thermos = heat and dynamis = power) is the physics of heat, work, enthalpy, and entropy changes in relation to the spontaneity of processes. In origins, thermodynamics is the study of engines. Prior to 1698, with the invention of the Savery Engine, horses were used to "power...

Efficiency related Images and Photos (experimental)

Efficiency Is For Robots Poster