efficacy vs efficiency

efficacy efficiency


  • 1) uncountable Ability to produce a desired amount of a desired effect.
  • 2) Power or capacity to produce a desired effect; effectiveness.
  • 3) Power to produce effects; operation or energy of an agent or force; production of the effect intended
  • 4) capacity or power to produce a desired effect
  • 5) Synonyms Efficiency, etc. (see effectiveness); virtue, force, energy.
  • 6) The quality of being efficacious or effectual; production of, or the capacity of producing, the effect intended or desired; effectiveness.


  • 1) A one-room apartment.
  • 2) The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended.
  • 3) The extent to which time is well used for the intended task.
  • 4) dated The quality of producing an effect or effects.
  • 5) The ratio of the energy delivered by a machine to the energy supplied for its operation.
  • 6) The degree to which this quality is exercised.
  • 7) The quality or property of being efficient.
  • 8) The ratio of the effective or useful output to the total input in any system.
  • 9) the ratio of the output to the input of any system
  • 10) skillfulness in avoiding wasted time and effort
  • 11) Specifically— The state of being able or competent; the state of possessing or having acquired adequate knowledge or skill in any art, profession, or duty: as, by patient perseverance he has attained a high degree of efficiency.
  • 12) Angström's method. Another method of measuring the radiant efficiency of a source of light is due to Knut Ångström. An opaque screen is mounted in such a position as to cut off all rays lying beyond the red end of the visible spectrum, and the remaining radiation is assembled upon the face of a bolometer by means of a cylindrical lens. The ratio of this quantity to the total radiation, measured by the same instrument, gives the radiant efficiency of the source of light. The radiant efficiency of such sources of light as have been measured by the two methods thus described is given in the following table. The values obtained by the integration of the energy-curves and by Ångström's method are marked respectively L and A.
  • 13) The quality of being efficient; effectual agency; competent power; the quality or power of producing desired or intended effects.
  • 14) While other sources of light have not as yet been measured by these methods, their relative efficiencies are approximately known, and by comparison with the above data we know that the radiant efficiency of ordinary oil- and gas-flames is about .01, that of the glow-lamp from .01 to .03, and that of the electric arc from .04 to .08. Gross efficiency. The term efficiency is likewise used to express the ratio of the energy in light-giving form developed in unit time by a source to the energy of combustion of the fuel which it is necessary to consume in order to maintain the source during that time. The efficiency thus defined takes into account the total heat-losses in the production of light. In the case of the flames of candles and of oil-lamps the heat lost by convection and conduction is very large compared with the total radiation from the flame. In the case of gas-flames the heat of combustion of the coal necessary to produce the gas to maintain the flame, as compared with the luminous energy emitted by the flame, gives the gross efficiency. In computing the gross efficiency of electric lights the heat of combustion of the fuel used to generate the current supplied to the lamps or the equivalent amount of energy, whatever be its source, is to be taken. In the case of a steam-plant for electric lighting the losses by dissipation of heat in the boiler, engine, dynamo, and lead-wires, together with the loss by convection and conduction in the electric lamp itself, all enter into the computation of the gross efficiency. Whatever process for the production of light may be employed, the amount of energy dissipated for the purpose of obtaining luminous radiation is very great, and the gross efficiency of luminous flames used in lighting ranges from .001 to .002, while the gross efficiency of electric lamps under the best existing conditions for the production of power is little if any above these figures. Electric efficiency. It is convenient in the case of the electric light to express the efficiency in watts per candle—a method not comparable with the energy-ratio defined above, but useful for the comparison of the various types of lamp used in electric lighting. The electric efficiency of the ordinary lamp ranges between four watts per candle and three watts per candle, according to the temperature of the filament, that of the arc-light from two watts per candle to one watt per candle (mean spherical candle-power), while the efficiency of the Nernst lamp is intermediate between that of the arc and the glow-lamp.
  • 15) In mech., the ratio of the useful work performed by a prime motor to the energy expended. Synonyms Efficacy, etc. See effectiveness.


  • 1) Their role is to assess the safety and efficacy of new treatments.
  • 2) The next round of trials will delve further into the efficacy of the treatment.
  • 3) Phase two tests the efficacy of a treatment.
  • 4) It will allow doctors to measure the progress of the disease and the efficacy of treatments.
  • 5) This incident shows the efficacy of ejection seats.
  • 6) It also questioned the efficacy of retention bonuses.
  • 7) But questions about its efficacy are no surprise.
  • 8) This riot of manifesto pledges then calls into question the very efficacy of politics as an agent of change.
  • 9) In the case of a medicine this includes all the safety and efficacy tests required before it can be introduced to clinical practice.
  • 10) As with any new technology, rigorous testing for both safety and efficacy is of course essential.
  • 11) The first stages of a clinical trial are to prove the safety, the quality and the efficacy of a drug.
  • 12) The efficacy of a treatment is not within the judgement of the CQC.
  • 13) While the study could assess the treatment 's efficacy, it was not big enough to assess its risk.
  • 14) Regulators had concluded there were no major quality, safety or efficacy issues to be resolved, the company said.
  • 15) If it is a cosmetic and not an over-the-counter drug, it has not received approval for safety and efficacy.
  • 16) The rejection of cannabis preparations for the release of spasms experienced by patients with MS is on the grounds that its efficacy is not proven in trials.
  • 17) ‘It'll be some time before the safety and efficacy of the other products is proven.’
  • 18) ‘The power of transformation or efficacy of the commodity is often a selling point.’
  • 19) ‘Blood tests may be needed periodically to monitor the treatment and its efficacy.’
  • 20) ‘Drugs with comparable efficacy but better safety profiles later appeared on the market.’
  • 21) ‘However, there is very little evidence on the comparative efficacy of classes of drugs.’
  • 22) ‘There was a lack of data on efficacy and adverse effects for all the other drugs.’
  • 23) ‘On its own this finding is insufficient to define the relative efficacy of the two treatments.’
  • 24) ‘He argued that monitoring of treatment efficacy would be difficult and expensive.’
  • 25) ‘It has proved efficacy in the treatment of depression and has been shown to be cost effective.’
  • 26) ‘In order to have any efficacy whatever, a world organization must be able to override big states as well as small ones.’
  • 27) ‘The partisanship has even reduced their efficacy as a binding force of our nation.’
  • 28) ‘They have had seven matches together, but judgment on their efficacy has been reserved.’
  • 29) ‘The sooner the morning after pill is taken after sex the greater its efficacy.’
  • 30) ‘Concerns about the safety and efficacy of human cloning, then, do not warrant a ban in law.’
  • 31) ‘Our aim was not to assess efficacy of antibiotics but the effectiveness of prescribing strategies.’
  • 32) ‘The trials also showed that efficacy is sustained during a one-year treatment period.’
  • 33) ‘The report noted that it does not evaluate the actual efficacy of the programs themselves.’
  • 34) ‘Well, I don't have a huge list of examples but I've seen enough to convince me of it's efficacy.’
  • 35) ‘Clinical trials are in progress to assess its efficacy in severe asthma.’
  • 36) ‘The government claims this is part of a research project to test the safety and efficacy of the drug.’


  • 1) Hospital efficiency and quality are largely determined by the quality of hospital management and organisation.
  • 2) Check door rope seals are airtight to maintain fuel efficiency.
  • 3) You will also receive energy efficiency advice that can help you to reduce your bills.
  • 4) Much depends on whether the government chooses to prioritise energy efficiency or cutting red tape.
  • 5) The site also explains where to make improvements in energy efficiency and how much they could save you on your bills.
  • 6) Bleed radiators to increase their efficiency.
  • 7) Their review process is based on a treatment's cost effectiveness and efficiency.
  • 8) It's about effectiveness and efficiency.
  • 9) Change your driving habits to optimise fuel efficiency as well, and you can make a tank of petrol go 30 per cent further.
  • 10) Other areas to watch out for include an increase in efficiency savings expected from government departments to 25 per cent from 20 per cent.
  • 11) Another threat to the electric vehicle is the advances in the efficiency of petrol engines.
  • 12) Some profitability or efficiency ratios can be linked in useful ways.
  • 13) It would have been cheaper to ignore energy efficiency.
  • 14) When the scrum was working at full efficiency they played their best rugby of the season.
  • 15) So one incremental increase to efficiency across the organisation can make a huge difference.
  • 16) It offsets the impact of growing fuel efficiency.
  • 17) There has been little intensification in the name of agricultural efficiency.
  • 18) Transfer of skills makes the jump from training efficiency to training effectiveness.
  • 19) These takeovers have little to do with relative efficiency or quality of management.
  • 20) It has features that improve energy efficiency.
  • 21) Managers in the efficiency organization must work closely with their counterparts in the exchange and emergence groups.
  • 22) It promotes the circulation and increases the efficiency of the lymph glands and ducts in the area.
  • 23) It found that a third of buyers said fuel efficiency was their main priority.
  • 24) The team approach may produce positive motivational effects as well as improved efficiency and effectiveness.
  • 25) Improved productivity in healthcare is about improved quality and efficiency.
  • 26) But we also need to do more to deliver efficiencies and that work is already under way.
  • 27) Fuel efficiency is the only guaranteed way of averting higher prices.
  • 28) No one could question the effectiveness and efficiency of this charity.
  • 29) If they continue to improve quality and efficiency the future is bright.
  • 30) Polar bears and arctic warblers and whales live on the margin: they survive by energy efficiency.
  • 31) But because of what is happening with the volatility of oil prices, engine efficiency has become a critical issue.
  • 32) Some engines are turned on and off, with the cars coasting for as far as they can to increase fuel efficiency.
  • 33) Back then, mpg figures were worsening as demand for bigger vehicles and better safety technology piled on weight that overwhelmed any advances in engine efficiency.
  • 34) PER, see protein efficiency ratio.
  • 35) Mechanical efficiency cannot tell me whether the tons are worth the illnesses, because there is *no common metric of mechanical efficiency*.
  • 36) The announcement marks an exciting leap forward in efficiency for electric vehicles and working closely with their powertrain partner, Zytek Automotive, a brand new, innovative, lightweight and fully integrated electric motor, control system and battery will be designed to ensure that maximum efficiency is achieved.
  • 37) SunPower, probably the industry leader in efficiency, is about to release a model with 23 percent efficiency.
  • 38) Again efficiency is not the problem but I think that a government that did not fire rockets into Israel on a regular basis would be nice.
  • 39) The debate seems ridiculous because one can't define the term efficiency when looking at the aggregate because efficiency only matters on the individual level.
  • 40) First, by way of a parenthesis, I don't think my logic about the use of the term efficiency was circular, as my points were the differences between material efficiency (how efficiently the system works in terms of itself) and human efficiency (how efficiently it serves people).
  • 41) "First, by way of a parenthesis, I don't think my logic about the use of the term efficiency was circular, as my points were the differences between material efficiency (how efficiently the system works in terms of itself) and human efficiency (how efficiently it serves people)."
  • 42) As far as solar cookers are concerned, the term efficiency is not dealt with uniformly in professional circles.
  • 43) ‘Sri Lanka has identified health as an area where information technology should be used to boost efficiency and service quality.’
  • 44) ‘The nation's translation industry is often criticized for its poor quality and lack of efficiency.’
  • 45) ‘He spends most of his time assessing quality and efficiency at the plant.’
  • 46) ‘The harbor has been working to improve service quality and operational efficiency.’
  • 47) ‘For us, it is important to increase efficiency, effectiveness and transparency in budgeting.’
  • 48) ‘Increased productivity and efficiency in business today depend on the appliance of science.’
  • 49) ‘As the amount of glass used in a house increases, the energy efficiency usually decreases.’
  • 50) ‘Too much pressure is detrimental to our effectiveness, productivity and efficiency.’
  • 51) ‘They are clamouring for ways to increase efficiency without taking any risks with the quality of the food.’
  • 52) ‘As a consequence, the Senate began to act with new efficiency and effectiveness.’
  • 53) ‘The recuperator recovers energy from the exhaust gases to increase fuel efficiency.’
  • 54) ‘Like any factory if the working environment isn't ideal productivity and efficiency will suffer.’
  • 55) ‘The regulator also said the company needed to focus on improving efficiency and quality of its service.’
  • 56) ‘The plan mostly includes the increase of energy efficiency and cuts in the amount of energy we use.’
  • 57) ‘Many options that improve energy efficiency are available.’
  • 58) ‘The announcement, accompanied by proposals to achieve greater energy efficiency, has delighted environmental campaigners.’
  • 59) ‘The initial goal of the reformers was to achieve greater economic efficiency through the rapid privatization of all state-owned assets.’
  • 60) ‘We will also try to boost operational efficiency to offset a possible decline in our profitability.’
  • 61) ‘There is no guarantee that financial liberalization will enhance economic efficiency, nor that privatization will guarantee competition.’
  • 62) ‘Many laboratories have been quite successful in examining the efficiency of their operations.’
  • 63) ‘Some projects which were funded simply achieved budgetary efficiencies, he said, and did not require as much money as had been first thought.’
  • 64) ‘Mr Prendergast said a constant and ongoing review is in place at Lakeland to identify where further operating efficiencies can be achieved.’
  • 65) ‘Environmental management can achieve efficiencies in how we operate at a business level, with resulting bottom line benefits.’
  • 66) ‘It also pledged an extra 1.5% in both years if the company met targets on punctuality and achieved cost efficiencies.’
  • 67) ‘Scottish Water has begun making some of the tough decisions to achieve the efficiencies the Water Industry Commissioner requested.’
  • 68) ‘Dr O'Donovan said he feared that the scale of cuts proposed could not be achieved through efficiencies and financial juggling alone.’
  • 69) ‘In terms of the market, the company and its growers must look to all their operations to achieve further efficiencies.’
  • 70) ‘Achieving greater operating efficiencies is one way to counteract this problem.’
  • 71) ‘With costs of production increasing and pressure on milk prices, improving efficiencies and controlling costs are all important.’
  • 72) ‘When mergers do occur, rationalization of assets based on your plan of action is a key step in achieving overall efficiencies.’
  • 73) ‘The government and business must press ahead with full-scale corporate restructuring if greater efficiencies are to be achieved.’
  • 74) ‘What's more, an operation will see the elimination of waste because of the efficiencies achieved.’
  • 75) ‘The more we rely on markets to achieve efficiencies, the more we need transparent reporting.’
  • 76) ‘The group has changed its name in an effort to boost business by improving services and increasing operational efficiencies.’
  • 77) ‘Hargreaves says there are new ways of delivering water and sewerage services to increase efficiencies.’
  • 78) ‘He said it would further the rationalisation of the dairy processing industry in Ireland and lead to cost savings through greater efficiencies.’
  • 79) ‘It has continued its growth, improved its efficiencies, struck huge outsourcing deals and kept its place around the top of the corporate finance league tables.’
  • 80) ‘Farmers will play their part and continue improving their efficiencies, and grow their enterprise to the extent that they can.’
  • 81) ‘He remains committed to improving efficiencies to deliver strong profit growth.’
  • 82) ‘The following day's headlines focused on McConnell's comments on achieving greater efficiencies in the public sector.’
  • 83) ‘They emit no pollutants and have impressive energy efficiencies.’
  • 84) ‘Chiller energy efficiencies have steadily climbed over the past years.’
  • 85) ‘They appeal because of the very high energy efficiencies they offer and the lack of environmental impact.’
  • 86) ‘Compare the energy efficiencies and operating costs of competing models.’
  • 87) ‘It is true that the fuel cells themselves have very low emissions and efficiencies up to 55 percent.’

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