The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
The ratio of useful work to energy expended.
(see also allocative efficiency and technical efficiency) The extent to which the maximum possible benefit is achieved out of the available resources.
Efficiency measures how effectively the resources of the multiprocessor system are used. Quantitative definitions of efficiency generally take the form: = (Tref / P * Tpar(P)) where P is the number of nodes, Tref is some sequential reference time, and Tpar(P) the parallel time. The most rigorous definition of efficiency sets Tref to the execution time for the best sequential algorithm corresponding to the parallel algorithm under study. When analyzing parallel programs, "best" sequential algorithms are not always available, and it is common to use the runtime for the parallel program on a single node as the reference time. This can inflate the efficiency, since managing the parallel computation always (even when executing on one node) incurs some overhead.
A ratio showing the number of units of production generated per unit of resource (Technical Efficiency). See Economic Efficiency.
see energy efficiency.
A performance measurement that tracks actual vs. expected resource usage for a given volume or output. If labor costs for a given period are higher than expected, it could be due to: 1) a labor efficiency variance caused by using more labor hours for the amount of units produced than the standard or expected hours, or 2) a labor rate variance caused by using a more highly-paid group of workers than the standard.
The ratio of output power to input power, stated as a percentage. Efficiency is a measure of energy losses in a drive as work is transmitted through it. Dojen drives, unlike other cycloidal drives, may have higher efficiencies because of the lower friction which results from the cam rolling--not sliding--through the axis of rotation. Efficiency is affected by load, temperature, lubrication, and tare torque.
The ratio of output to input. See also Combustion, Fuel-to-Steam and Thermal Efficiency.
Hyötysuhde Verkningsgrad For instance, the ratio of the actual production and the theoretically possible production.
For a heat engine, the ratio of work done by the engine to heat intake. Efficiency is never 100%.
A measurement of how much of the input electrical energy to a speaker is converted into sound. The remaining energy is converted to heat. Most direct radiator speakers are 1 or 2 percent efficient; a horn-loaded speaker might approach 20 percent, some reach as high as 30 percent. High efficiency means that a lower powered amplifier can be used to produce the same level, but there is also a case to be made for less efficient speakers actually being more accurate due to better damping and less susceptibility to resonances.
A product's ability to utilize input energy, expressed as a percentage.
The comparison of the useful work or energy provided by a machine or system with the actual work or energy supplied to the machine or system. Efficiency is usually stated as a percentage. The formula is as follows: percent efficiency = energy output/energy input x 100
The achievement of either maximum useful output from the resources devoted to an activity, or the required output from the minimum resource input.
The ratio of the effective or useful output to the total input in any system.
The extent to which results are achieved with minimum use of resources. The degree to which an organization generates its products and services using a minimum of inputs.
The ratio between useful work performed and the energy expended in producing it. It is the ratio of output power divided by the input power.
How economically have an intervention's inputs been converted into outputs and results? See also inputs, intervention logic, outputs, results.
1) Sleeping room at a housing facility with food preparation amenities. 2) The ratio of input and output usually expressed in a percent. For example, a loudspeaker, which produces 8 acoustic watts when fed 100 electrical watts, is 8% efficient.
The ratio of useful energy delivered compared to the energy supplied to it over a specified time frame or cycle.
The ratio of energy utilized divided by the energy expended.
In the context of energy use, it is a measure of the amount of useful energy produced as a percentage of the primary resources consumed.
(1) a user-oriented quality requirement specifying the degree to which an application or component effectively uses (i.e., minimizes its consumption of) its computing (e.g., memory, processor) and personnel (e.g., operations, user support) resources.(2) a quantitative quality factor measuring the degree to which an application or component effectively uses its memory and computing resources.
The total output power (usually in watts) divided by the input power with a given load. In equation form, percent efficiency at a specified load is: % Efficiency = (output / input) 100 or 1 -(losses / input) 100 where losses, output and input are expressed in watts.
is the ratio of the output to the input of any system.
Although a speaker's efficiency rating is almost always correlated to its sensitivity rating, it is actually a different measurement. The efficiency rating for a speaker is a measure of how well a speaker converts watts of electrical power into watts of acoustical power. Most speakers have a very low efficiency rating — between 1% and 10% — so manufacturers rarely provide this information, choosing instead to list sensitivity ratings.
Efficiency is a measure of performance expressing the results obtained as a percentage of effort or energy put in. On this basis thermal efficiency is the percentage of the potential heat content of a fuel which becomes usefully available as hot water (or hot air in the case of a space heater). Thermal efficiency is a measure of performance under stated conditions, and the efficiency will vary as the conditions are varied. Accordingly, official or test thermal efficiencies should not be quoted or used unless the circumstances are comparable to the method of test. The Energy Rating or "Star Rating" scheme used in the labelling of gas water heaters (no such scheme applies to electric water heaters) is intended to assist the consumer in comparing the relative efficiencies of gas appliances on offer in the market. The Star Rating assigned to a product on the basis of a test, which models the hot water usage of a "typical" household.
Output power divided by Input Power. This will vary depending on the load and AC input voltage. Values shown are usually nominal at rated voltage and load.
In the context of the CAC Act, the extent to which an Australian Government authority has maximised the outputs produced from a given level and quality of inputs or minimised the inputs used to produce a given level and quality of outputs.
Context is: trade term. Narrowly, the input-output relationship between the quantity of materials used and the quantity of goods produced. More broadly, economic efficiency implies the best result (taking quality as well as quantity into account) in the production or distribution of goods and services at the least cost. Most economists believe the reduction of barriers to trade contributes to international economic efficiency by encouraging countries to specialize in the production of those goods and services in which they have a comparative advantage, thus making the world's most competitive goods and services available to consumers outside the area that produces them. See also Comparative Advantage; Competitive; Entrepreneur; Textiles; Trade Diversion; Welfare.
The ratio of the output to the total input in a process.
The amount of applied energy, in percentage, that is employed in deforming the workpiece to the total energy expended by the forging equipment.
for a photovoltaic cell, ratio between the maximum electric output power and the product of the surface of the generator by the incident lighting measured
in a fuel cell, ratio between the electric power supplied and the calorific value of the hydrogen injected, excluding consumption by the auxiliaries
the optimal transformation of inputs into outputs.
This is used to describe the performance of speakers. It relates to how much sound you get out for the power put in.
The fraction of decay events from a standard sample seen by a detector in the peak corresponding to the gamma ray energy of the emission, and stored by a detection system. Also called Peak Efficiency. Used to calibrate the system for quantitative analyses. Also used to specify germanium detectors, where the relative efficiency of the germanium detector is compared to a standard (3 x 3 in.) NaI(Tl) detector. Compare total efficiency.
how well resources are used. Achieving service or project outcomes at a reasonable cost and in reasonable time.
The ratio of energy expended (work performed, generally in Calories) to energy required (Calories eaten in the case of human efficiency).
The ratio of resources productively used to the resources available. Low transport efficiency generally means that some infrastructure capacity is being paid for, but not used. See utilization.
Ensuring that goods and services are allocated so as to maximise the welfare of the community.
The relationship between the performance level of the system (expressed in the transaction volume and overall speed) and the amount of resources (CPU cycles, I/O time, memory and network capacity, etc.) that are used.
The rate at which a (heating) system maximizes fuel use. This rate is numerically described as a ratio called AFUE. As of January 1992, no furnaces can be manufactured with efficiencies lower that 78% AFUE. Boilers cannot be manufactured with efficiencies lower than 74% AFUE.
output of a machine (work done by the machine) divided by the input (work put into the machine), usually expressed as a percentage. Because of losses caused by friction, efficiency is always less than 100%, although it can approach this for electrical machines with no moving parts (such as a transformer).
In general sense, efficiency is the ration of energy output to the total energy input, expressed as a percentage. In speaker systems, efficiency refers to the ration of total acoustic watts radiated to total electrical watts input. Home speaker systems of 1% to 3% efficiency are typical, while larger horn-loaded sound reinforcement speakers sometimes reach 10% efficiency or more. Efficiency should not be confused with sensitivity, which measures only the on-axis sound pressure level in relation to electrical input power.
The most effective use or allocation of resources to yield the maximum benefits. Efficiency in one sense — the effective use of resources — is often applied to individual firms in comparing how well they organize the productive process (labour, management, machinery, new technology) to achieve the lowest possible production cost for their products. In a broader sense it refers to the way in which all of the various factors of production are used to achieve maximum output throughout the economy at the lowest cost, or to achieve a distribution of the output of society that results in the greatest degree of satisfaction.
With respect to solar cells, the percentage of light energy that is converted to electricity by the cell. Depending on cell technology and production technique, this ranges from as low as 5% to as high as 30%.
careful use of resources, such as time and space
a principle which is concerned with achieving a desired result using a specified level of resources; ie., outputs are maximised for a given level of resources or resources minimised for a given level of output.
The ratio, specified in percent (%), of output power to input power. Although normally specified at full rated load current, multiple data points can be useful when determining thermal burdens under typical conditions. EMI - The abbreviation for lectro agnetic nterference, the undesirable electronic noise that can be generated by a power converter. This noise, if not contained inside the converter, can interfere with the proper operation of other equipment in the vicinity of the noise source.
The efficiency of a light source is simply the fraction of electrical energy converted to light, i.e. watts of visible light produced for each watt of electrical power with no concern about the wavelength where the energy is being radiated. For example, a 100 watt incandescent lamp converts 7% of the electrical energy into light; discharge lamps convert 25% to 40% into light. The efficiency of a luminaire or fixture is the percentage of the lamp lumens that actually comes out of the fixture.
The ability of a driver to convert electrical energy into sound energy without wasting too much electrical energy.
The fraction of the energy supplied to a device which transferred in a useful form. Energy
The extent to which an organization or program is producing its planned outputs in relation to the expenditure of resources.
The relationship between the outputs (goods and services) and the resources input. The extent to which maximum output is achieved from a given input, or minimum input for a given output.
The rate at which a furnace maximizes fuel use. This rate is numerically described as a ratio called AFUE (see AFUE). As of January, 1992, no furnaces can be manufactured with efficiencies lower than 78 percent AFUE. High-efficiency furnaces will be rated 88 to 97 percent AFUE. See also SEER and HSPF for efficiency ratings for heat pump systems.
The ratio of the output of a device, system, or activity to the input required to generate that output
Efficiency can be measured in several different conditions, such as full-load or nominal line. If you are using a multiple output switching power supply, you would calculate efficiency based on the total power output and the division of the separate outputs.
This is a fraction ofthe total energy input to the system which is applied to the energy output. The efficiency ranges from zero to one.
Obtaining optimal benefits for a given set of inputs, or ‘doing the most with what we have’; this can be measured at various levels: the individual fisher or vessel, the fleet, the fishery as a whole, or the coastal region, depending on what level is appropriate. (For example, from the perspective of society as a whole, efficiency may be measured at the scale of what is best for the on-shore economy and relevant coastal communities.)
A measure (usually a ratio) of the useful energy provided by a dynamic system versus the total energy supplied to it during a specific period of operation.
The measure of a device's ability to convert input power to work. Expressed as a percentage. See: Sensitivity
ef- fish-en-see A way of saying how much energy something wastes.
The percentage of electrical energy generated at a power station that is delivered to customers. Power flowing through cables and overhead conductors heats them up, causing losses. Designing of distribution system trades off the higher cost of larger cables against the cost of losses.
Tells you what percentage of the power arriving at a speaker gets turned into sound (as opposed to heat). Often expressed as decibels/watt@ 1 meter (dB/w/m.)
In a projector efficiency is defined as the ratio of the acoustic power generated to the total electrical power input. Efficiency varies with frequency and is expressed as a percentage.
The measure of loudspeaker's ability to convert power to work. Formula Efficiency = (power out/power in) x 100. Efficiency is always expressed as a percentage.
For a UPS, output power divided by input power. Efficiency measures the power required to run the UPS.
The relationship of outputs (services produced) to inputs (resources used to produce the services). Increasing efficiency is a matter of achieving the same outputs with fewer resources or more outputs for the same amount of resources.
Relates to maximizing the quality of a comparable unit of health care delivered or unit of health benefit achieved for a given unit of health care resources used.
Ratio of a loudspeaker's acoustical output to a given electrical input. A loudspeaker's sound pressure level is measured in decibels.
The efficiency of a technical system is a measure of the ratio between the benefit achieved and the effort employed, or also the ratio between useful energy and the energy input. Thus, it indicates the quality of a process.
a measure of the probability that a count will be recorded when radiation is incident on a detector. Usage varies considerably so be aware of which factors (window, transmission, sensitive volume, energy dependence, etc.) are included in a given case. At Michigan State University, we are referring to the percent of total activity present for a given nuclide detected by the radiation detection instrument being used.
relative economy with which resources are employed to achieve approved outcomes.
the measure of how well something uses the energy it receives [It is calculated by dividing the Energy Output of an organism (or machine) by the Energy Input. The formula for this is Ef = Eo/Ei. The answer will always be less than one. It is impossible (so far) to get more energy out than you put in.
The ratio of a device's energy output to its energy intake.
the ratio of useful work achieved to the amount of effort and resources used
The ratio between the number of counts registered by the instrument and the number of disintegrations of the radioactive source for a given unit of time. Efficiency is usually expressed as a percentage. It is a function of the geometry and design of the detector, as well as the internal electronics. It is also dependent on the type and energy of radiation being monitored.
the degree to which a certain action or level of work can be effectively produced for the least expenditure of effort or fuel. For instance, a light bulb that uses 15 watts of electricity to produce 900 lumens of light would operate with much greater efficiency than one that required 60 watts to produce the same light level.
The ration between output power (in watts) and input power (in watts). The closer to 1 the value, the better the efficiency.
The evaluation of how well the resources have been used, irrespective of the purpose for which they have been deployed.
The ratio of work output to work input as a percentage see table efficiency (practical)
The relationship between efforts (or inputs) to outputs or outcomes. Measured by indicators of the resources used or cost per unit of output or outcome. A resource-usage concept, also with a least-cost notion, that is concerned with maximizing outputs at minimal cost or using minimum resources.
(efficience ) - a term used in value-for-money auditing, referring to the use of financial human and physical resources in a manner that maximizes resources inputs for any given quantity of output
Relating to heat, a percentage indicating the available Btu input that is converted to useful purposes. It is applied, generally, to combustion equipment.
The ratio of the count rate given by a radiation detection instrument and the actual disintegration rate of the material being counted.
Solar collector efficiency is usually expressed as a percentage value, or in a performance graph. When assessing a collector's performance make sure it is based on the correct surface area values. Eg. If performance values are based on gross area, then the gross area must be used when determining total heat output. IAM values have a significant influence on actual heat output throughout the day, and should be considered. Looking at just the percentage efficiency value will not give a true indication of daily heat output. Efficiency testing is usually completed by testing bodies such as SPF, SRCC and other government approved testing bodies. Tm* is the x axis value on performance graphs for solar collectors. Tm* is calculated as: (water temp - ambient temp)/Insolation Eg. (44oC - 20oC)/800Watts = 0.03 For more information on efficiency please click here.
The measurement, stated as a percentage, of a speed reducer's ability to perform adequate speed reduction. Efficiency represents the comparison of power input and power output.
A measure of resource commitment to the activity.
The ratio of desired work-type output to the necessary energy input, in any given energy transformation device. An efficient LIGHT bulb for example uses most of the input electrical energy to produce light, not heat. An efficient HEAT bulb uses most of its input to produce heat, not light.
The resources expended in relation to the speed, accuracy and completeness of tasks performed.
Energy transfer efficiency expressed as the ratio of the sum of the energy leaving the PX unit or array divided by the sum of the energy entering, as calculated with the following equation: Efficiency = âˆ‘(Pressure x Flow) OUT x100%âˆ‘(Pressure x Flow) IN
A rating of the percentage of input power transmitted through the transformer. This number will never be 100% in the real world due to copper losses, eddy-current losses and other inefficiencies.
The ratio of work done or energy developed by a machine or engine, to the energy supplied to it.
Extent to which processes and activities are productive in terms of resources consumed.
A measure of performance that compares output with cost or resource utilization
The ratio of power output to power input.
Generally speaking, efficiency is the ratio of total energy output to total energy input, expressed as a percentage. Loudspeaker efficiency is usually very low, in the 1% to 3% range, meaning 97% to 99% of the energy is dissipated as heat! A typical car audio amplifier has an efficiency of 50%. Rockford Fosgate amplifiers efficiency ranges from 50% to about 70%, which means less current drawn from your electrical system for a given amount of power than our competitors.
In everyday language, the ratio of outputs to inputs; in economics, optimality.
Efficiency is the ratio of energy output to energy input, such as the ratio between the electrical energy input to a motor and the mechanical energy output at the shaft of the motor.
Power out of the equipment divided by power in.
Under the First Law of Thermodynamics, efficiency is the ratio of work or energy output to work or energy input, and cannot exceed 100 percent. Efficiency under the Second Law of Thermodynamics is determined by the ratio of the theoretical minimum energy that is required to accomplish a task relative to the energy actually consumed to accomplish the task. Generally, the measured efficiency of a device, as defined by the First Law, will be higher than that defined by the Second Law.
The extent to which a program has used resources appropriately and completed activities in a timely manner.
A general term used to describe how effectively a heat pump air conditioning system or furnace converts incoming energy to outgoing energy The higher the number the more efficient the unit and the lower the operating costs
Measure of production or productivity relative to input resources. Efficiency refers to operating a program or project, or performing work tasks economically. Relates to resources expended or saved, not the effectiveness of performance.
Ratio of the energy output of a device and its input, normally expressed in %. The absolute maximum of efficiency of any device is 1. Efficiency of loudspeakers is usually so low that manufacturers use to rate it in terms of sensitivity, not to disappoint users. However, sensitivity does take directivity in account, and hence cannot properly reflect efficiency.
The efficiency of a motor is the ratio of mechanical output to electrical input. It represents the effectiveness with which the motor converts electrical energy into mechanical energy. NEMA has set up codes which correlate to specific nominal efficiencies. A decrease in losses (the elements keeping the motor from being 100% efficient of 10% constitutes an upward improvement of the motor of one code on the NEMA table. Each nominal efficiency has a corresponding minimum efficiency number.
A measure of how economically resources/inputs (funds, expertise, time, etc.) are converted to results (DAC). Efficiency, thus, means comparing outputs to inputs (Denmark).
Ratio of a wire rope's actual breaking strength and the aggregate strength of all individual wires tested separately-usually expressed as a percentage.
Output power divided by input power, (work performed in ratio to energy used to produce it).
A rating on comfort equipment is similar to the miles per gallon rating on your car. The higher the rating number, the more efficient the system and the lower your fuel consumption will be. You can save a lot of money with a high efficiency unit. Depending on your local climate, lifestyle and electricity rates, savings will vary. For furnaces. it is the rate at which a furnace maximizes fuel use. This rate is numerically described as a ratio called AFUE (see AFUE). As of January, 1991, no furnaces can be manufactured with efficiencies lower than 78% afue. High efficiency furnaces will be rated 85 to 95% afue.
Each speaker should get equally loud with equivalent power, so all speakers play at the same appropriate relative volume.
The relationship between the level of performance of the product and the amount of resources used, under stated conditions.
Efficiency is one of the measures needed to determine value for money. It concerns the ratio of inputs (economy) to output (effectiveness) and is sometimes referred to as 'bangs per buck'. Typical measures will include money, time, people and quality. See also Economy, Effectiveness, Value for Money.
The ratio of output work done to input work. The higher this ratio, the better the machine is, since it loses less heat, and does more for the energy it intakes. A low efficiency means more heat is being lost.
The ratio of the output to input power times 100, expressed as a percentage. Efficiency = (Pout/Pin) x 100.
A measure of hardware utilization, equal to the ratio of speedup achieved on processors to itself.
In holography, this refers to the brightness of an image. It is the ratio of diffracted to incident light intensity.
The ratio of input power (or energy) to output power (or energy) expressed as a percentage.
The ratio of output power divided by input power, expressed as a percentage.
The ratio of energy output to total energy input, expressed as a percentage. With speakers, this refers to the ratio of total acoustic watts radiated to total electrical watts input.
The ratio of the outcome or output to the input of any program; the degree to which programs are executed or activities are implemented to achieve results while avoiding wasted resources, effort, time, and/or money.
Relates to the light output from a fixture (luminaire) as a percentage of light output from the bulb or bulbs it uses.
the amount of usable energy given off by an energy conversion compared to the total amount of energy used in the conversion
Ratio of output energy to input energy for a device. Often refers to the amount of energy lost in the form of heat during DC to AC inverter operation.
The ratio of the output to the input of energy or power, expressed as a percentage.
Output of a device, system, or activity, divided by the input necessary to create the output.
The ratio of the output power from the UPS to the input power from the utility. This shows the percentage of the input power that is available as useful output power. For example, a UPS that is 95% efficient delivers 95% of the utility power it receives to the load. The remaining power takes the form of dissipated heat.
The degree to which a system or component performs its designated functions with minimum consumption of resources.
an attribute of those schools, teachers, programs, and approaches that balance effectiveness against considerations of costs (i.e., are effective with a minimum use of resources). See Effectiveness.
A measure of the proportion of electrical energy fed to a loudspeaker that is turned into acoustic energy. Most loudspeakers are very low efficiency transducers (typically around 5 per cent). Only horn loudspeakers manage a much higher efficiency (sometimes around 30 per cent).
Ratio of output power compared to input power.
It is defined as the ratio of work got out to work put in. It is important to cut down the energy wasted so that the useful work obtained from a machine is as high as possible.
The ratio of electric energy produced to the amount of solar energy incident on the cell or module. Typical crystalline solar modules are about 10% efficient -- they convert about 10% of the light energy they receive into electricity.
The relationship between the result achieved and the resources used.
The degree to which outputs are achieved in terms of productivity and input (resources allocated). Efficiency is a measure of performance in terms of which management may set objectives and plan schedules and for which staff members may be held accountable.
A measure of the effective or useful output of a system compared to the input of the system.
of a motor is the ratio of output power to input power, and is expressed in percent.
An indicator that tells how well the audio system transforms electrical signals of a given power into sounds.
The ratio of useful energy produced by a system (such as a fuel cell) compared to the energy supplied (usually chemical energy).
The ratio of lumens emitted by the light source to the wattage consumed expressed as lumens-per-watt. (See lumens-per-watt.)
A percentage obtained by dividing the actual power or energy by the theoretical power or energy. It represents how well the hydropower plant converts the energy of the water into electrical energy.
A measure of how little time, cost and/or effort is wasted in order to achieve intended results. Measures of an efficient information system include its productivity, processing time, operational costs and level of automation. Measures of an efficient information product include the speed of processing, the functionality of the solution, the ease of use of the solution and output and the cost of information processing.
a measure of productivity relative to inputs of human and other resources.
The percentage of input power available for use by the load.
The ratio of electrical input to mechanical output. It measures the motor's effectiveness when converting electrical energy into mechanical energy.
Producing growth with little waste. Intact ecosystems are highly efficient organizations. Young ecosystems are much more wasteful with their use of energy.
The ratio of the useful energy delivered by a dynamic system (such as a machine, engine, or motor) to the energy supplied to it over the same period or cycle of operation. The ratio is usually determined under specific test conditions.
Reflects the amount of wasted energy.
The ratio of acoustic output power to electrical input power.
Found in electrical energy. It is the amount of a utility's power generation process that is efficiently used to produce power. However some power can be lost in the transmission process.
Measurement of useful light, as output in lumens, against the total lumens the light source produces.
The percentage of input energy that is converted into output energy. For a speaker this means taking AC power from an amp and converting it into acoustical energy (sound). For an amp this means taking in 12 volt DC power and converting it into AC power (wattage). Any wasted energy is dissipated as heat.
The output of energy divided by the input of energy, expressed in percentage.
Ratio of output power to input power, generally measured at full load with nominal line conditions.
The ratio of output energy to input energy.
The ratio of output work compared to input work. Efficiency is sometimes expressed as a percent, in which case the ratio is multiplied by 100 to give a percentage value.
The ratio of useful output to input power, determined in antenna systems by losses in the system including losses in nearby objects.
The ratio of power in terms of the input power against the output power. Efficiency is measured at full load and nominal line conditions.
The acoustic power delivered by a speaker for a given electrical input - that is, the amount of sound out for the amplifier power input.
The ratio of power output of a Photovoltaic cell to the incident power from the sun or simulated sun sources under specified standard insolation conditions.
a narrow mathematical I concept describing the proportion of a resource that can actually be converted' into useful product or work; for example, sunlight falling on a PV module contains a given amount of energy, but the module can only convert a percentage of it into electricity.
The ratio between output power and input effective power.
Relating to heat, a percentage indicating the available Btu input to combustion equipment that is converted to useful purposes.
As relates to ion exchange, a measure of the effectiveness of the operational performance of an ion exchanger, usually based on the ratio of output per unit of input. This ratio is often expressed as the amount of regenerant required to produce a unit of contaminant reduction capacity. For example: pounds of salt per kilograins of hardness removed or pounds of acid per kilogram of salt removed. SEE A:LSO salt efficiency.
A measure (as a percentage) of the actual output to the standard output expected. Efficiency measures how well someone is performing relative to expectations.
The amount of kinetic energy of the arrow just as it leaves the bow divided by the potential energy that went into drawing it, multiplied by 100.
A measure of how economically resources/inputs (funds, expertise, time, etc.) are converted to results. Source: OECD Glossary of Key Terms in Evaluation and Results Based Management
The measure of an amplifier or speaker's ability to convert input power to work. Expressed as a percentage.
Obtaining the most possible satisfaction from a given amount of resources. Efficiency for am economy is achieved when it is impossible to increase the satisfaction of wants and needs by producing more of one good and less of another. Contrast with inefficiency.
A measurement (usually expressed as a percentage) of the actual output to the standard output expected. Efficiency measures how well something is performing relative to existing standards; in contrast, productivity measures output relative to a specific input, e.g., tons/labor hour. Efficiency is the ratio of (1) actual units produced to the standard rate of production expected in a time period or (2) standard hours produced to actual hours worked (taking longer means less efficiency) or (3) actual dollar volume of output to a standard dollar volume in a time period. Illustrations of these calculations follow. (1) There is a standard of 100 pieces per hour and 780 units are produced in one eight-hour shift; the efficiency is 780/800 converted to a percentage, or 97.5%. (2) The work is measured in hours and took 8.21 hours to produce 8 standard hours; the efficiency is 8/8.21 converted to a percentage or 97.5 percent. (3) The work is measured in dollars and produces $780 with a standard of $800; the efficiency is $780/$800 converted to a percentage, or 97.5 percent.
The ratio of the useful energy output of a machine or other energy-converting plant to the energy input.
The ability of an audio device to turn mechanical energy to electrical (microphones, phonograph cartridges) or vice versa (loudspeakers, amplifiers). For example, the more efficient a loudspeaker is, the louder it will play with a given input. A typical acoustic-suspension speaker may be anywhere from 0.5% to 2% efficient; some horn speaker systems surpass 20%. The leftover energy is dissipated as heat. Under most conditions, efficiency has little to do with sound quality, but with speakers, high efficiency allows one to use a lower-powered amplifier.
A ratio of the input power compared to the output, usually expressed as a percentage. The ratio of the useful work performed and the energy expended in producing it.
Of boiler operation: Output in heat units divided by input in heat units. The number of Btus contained in all steam evaporated is useful output. The number of Btus contained in all fuel supplied to the boiler is input.
For a secondary cell, the ratio of the output on discharge to the input required to restore it to its initial state of charge under specified conditions. Can be measured in ampere-hour, voltage, and watt-hour efficiency.
The ratio of output per unit input or the effectiveness of performance of a system; in an ion exchange system, often expressed as the amount of regenerant required to produce a unit of capacity, such as the pounds of salt per kilo-grains of hardness removal.
The ratio of total output power to input power expressed as a percentage.
The amount of power delivered to the load of an amplifier as a percentage of the power required from the power supply.