efficiency definition, efficiency meaning | English dictionary

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      n   pl   , -cies  
1    the quality or state of being efficient; competence; effectiveness  
2    the ratio of the useful work done by a machine, engine, device, etc., to the energy supplied to it, often expressed as a percentage  
   See also       thermal efficiency  

current efficiency  
      n     (Physics)   the ratio of the actual mass of a substance liberated from an electrolyte by the passage of current to the theoretical mass liberated according to Faraday's law  
efficiency apartment  
      n     (U.S)   a small flat or bedsit  
electrode efficiency  
      n     (Chem)   the ratio of the amount of metal deposited in an electrolytic cell to that theoretically deposited according to Faraday's laws  
luminous efficiency  
      n   the efficiency of polychromatic radiation in producing a visual sensation. It is the radiant flux weighed according to the spectral luminous efficiencies of its constituent wavelengths divided by the corresponding radiant flux.,   (Symbol)    V  
quantum efficiency  
1      (Physics)   the number of electrons released by a photocell per photon of incident radiation of a given energy  
2      (Chem)   the number of chemical species that undergo reaction per photon of absorbed radiation of a given energy  
radiant efficiency  
      n   the ratio of the power emitted by a source of radiation to the power consumed by it.,   (Symbol)    ηe  
spectral luminous efficiency  
      n   a measure of the efficiency of radiation of a given wavelength in producing a visual sensation. It is equal to the ratio of the radiant flux at a standard wavelength to that at the given wavelength when the standard wavelength is chosen so that the maximum value of this ratio is unity.,   (Symbol)    V(λ)   for photopic vision  
V(λ)   for scotopic vision  
thermal efficiency  
      n   the ratio of the work done by a heat engine to the energy supplied to it  
   Compare       efficiency  
volumetric efficiency  
1    the ratio of fluid delivered by a piston or ram pump per stroke to the displacement volume of the piston or ram  
2    the ratio of air or gas-air mixture drawn into the cylinder of an internal-combustion engine to the volumetric displacement of the piston  
English Collins Dictionary - English Definition & Thesaurus  


ability, adeptness, capability, competence, economy, effectiveness, efficacy, power, productivity, proficiency, readiness, skilfulness, skill  

English Collins Dictionary - English synonyms & Thesaurus  

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