Difference between revisions of "Power Efficiency"
(Created page with "==Key Stage 4== ===Meaning=== '''Power efficiency''' is a ratio of useful power transferred to total power put into a system. ===About Eff...") |
(→Key Stage 4) |
||
| Line 13: | Line 13: | ||
<math>Efficiency = \frac{P_{Useful}}{P_{Total}}</math> | <math>Efficiency = \frac{P_{Useful}}{P_{Total}}</math> | ||
| + | |||
| + | |||
| + | Where: | ||
| + | |||
| + | 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]]. | ||
Revision as of 20:21, 2 February 2019
Key Stage 4
Meaning
Power efficiency is a ratio of useful power transferred to total power put into a system.
About Efficiency
- Power 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 Power Out)/(Total Power In)
\(Efficiency = \frac{P_{Useful}}{P_{Total}}\)
Where:
EUseful = The Useful Energy transferred to a device's intended purpose.
ETotal = The Total Energy transferred to a system.