Difference between revisions of "Energy Efficiency"
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<math>Efficiency = \frac{E_{Useful}}{E_{Total}}</math> | <math>Efficiency = \frac{E_{Useful}}{E_{Total}}</math> | ||
| − | Where | + | Where: |
E<sub>Useful</sub> = The [[Useful Energy]] [[Energy Transfer|transferred]] to a device's intended purpose. | E<sub>Useful</sub> = The [[Useful Energy]] [[Energy Transfer|transferred]] to a device's intended purpose. | ||
E<sub>Total</sub> = The [[Total Energy]] [[Energy Transfer|transferred]] to a [[system]]. | E<sub>Total</sub> = The [[Total Energy]] [[Energy Transfer|transferred]] to a [[system]]. | ||
Revision as of 20:21, 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 = (Useful Energy Out)/(Total Energy In)
\(Efficiency = \frac{E_{Useful}}{E_{Total}}\)
Where:
EUseful = The Useful Energy transferred to a device's intended purpose.
ETotal = The Total Energy transferred to a system.