Difference between revisions of "Energy Efficiency"
| Line 19: | Line 19: | ||
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]]. | ||
| + | |||
| + | ===References=== | ||
| + | ====AQA==== | ||
| + | |||
| + | :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Energy efficiency, pages 16-19, 21, GCSE Physics; Third Edition, Oxford University Press, AQA ''] | ||
Revision as of 11:21, 4 November 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.