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# Efficiency

## Efficiency is the ratio useful energy output to energy input.

A general definition of efficiency is the ratio between the useful energy or power output and the energy or power input - and can be expressed as

μ = Eo / Ei                                    (1)

where

μ = efficiency

Eo = useful energy or power output(Joules, W)

Ei = energy input or power (Joules, W)

## Related Topics

• ### Thermodynamics

Work, heat and energy systems.

## Related Documents

• ### 2nd Law of Thermodynamics

Entropy and disorder.
• ### Air Conditioner Efficiency

The ratio between heat removed and power (watt) used - EER and SEER.
• ### Boiler - Efficiency

Combustion gross and net calorific value.
• ### Carnot Efficiency

The efficiency of the Carnot cycle.
• ### Cooling and Heating - Performance and Efficiency Terminology

Performance and efficiency terminology related to heat pumps and air condition systems.
• ### Cooling Load - Convert between kW/ton to COP or EER

Convert between cooling load units like kW/ton, COP and EER.
• ### Electric Motors - Efficiency

Calculate electric motor efficiency.
• ### Fans - Efficiency and Power Consumption

Power consumption and typical efficiencies of fans
• ### Heat Pumps - Performance and Efficiency Ratings

Performance and efficiency rating of heat pumps.
• ### Heat Recovery Efficiency

Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.
• ### Power

Power is the rate at which work is done or energy converted.
• ### Power Plants - Performance Efficiencies

Power plants heat rates, thermal efficiencies, capacity factors, load factors, economic efficiencies, operational efficiencies and energy efficiencies.
• ### Wind Power

Power generation from wind.

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## Citation

• The Engineering ToolBox (2008). Efficiency. [online] Available at: https://www.engineeringtoolbox.com/efficiency-d_1394.html [Accessed Day Month Year].

Modify the access date according your visit.

7.25.9

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