Ratio between the useful output and the input of a machine
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Useful output energy is always lower than input energy.Efficiency of power plants, world total, 2008
Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radiation), or heat. The resulting value, η (eta), ranges between 0 and 1.[1][2][3]
^Energy Glossary, California Energy Commission (Accessed: April 3, 2021)
^What is efficiency?, NASA, Cryogenics and Fluids Branch (Accessed: April 3, 2021)
^Efficiency, J.M.K.C. Donev et al. (2020). Energy Education - Efficiency (Accessed: April 3, 2021)
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