Difference between revisions of "Energy Efficiency"
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Revision as of 20:15, 2 February 2019
Key Stage 4
Meaning
Energy efficiency is a ratio of Useful Energy transferred to total energy put into a system.
About Efficiency
- Energy efficiency is a measure of how effectively energy is transferred from one energy store into an intended energy store.
- Efficiency may be written as a percentage or as a decimal.
- Efficiency as a percentage can never be greater than 100% and as a decimal can never be greater than 1 because you can never get more energy out than you put in due to Conservation of Energy.
Equation
\(Efficiency = \frac{Useful_{ } Energy_{ } Out}{Total_{ } Energy_{ } In}\)