Difference between revisions of "Energy Efficiency"
| Line 5: | Line 5: | ||
===About Efficiency=== | ===About Efficiency=== | ||
: '''Energy 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]]. | : '''Energy 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 [[energy]] out than you put in due to [[Conservation of Energy]]. |
===Equation=== | ===Equation=== | ||
Revision as of 17:56, 6 April 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.