Difference between revisions of "Power Efficiency"
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===About Efficiency=== | ===About Efficiency=== | ||
: '''Power efficiency''' is a [[measure]] of how effectively [[energy]] is [[Energy Transfer|transferred]] from one [[Energy Store|energy store]] into an intended [[Energy Store|energy store]]. | : '''Power efficiency''' is a [[measure]] of how effectively [[energy]] is [[Energy Transfer|transferred]] from one [[Energy Store|energy store]] into an intended [[Energy Store|energy store]]. | ||
| − | : '''Efficiency''' may be written as a [[percentage]] or as a | + | : '''Efficiency''' may be written as a [[percentage]] or as a decimal. |
| − | : '''Efficiency''' as a [[percentage]] can never be greater than 100% and as a | + | : '''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 [[power]] out than you put in due to [[Conservation of Energy]]. |
===Equation=== | ===Equation=== | ||
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Where: | Where: | ||
| − | + | P<sub>Useful</sub> = The useful power [[Energy Transfer|transferred]] to a device's intended purpose. | |
| − | + | P<sub>Total</sub> = The total power [[Energy Transfer|transferred]] to a [[system]]. | |
Latest revision as of 17:56, 6 April 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 power 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:
PUseful = The useful power transferred to a device's intended purpose.
PTotal = The total power transferred to a system.