Power
Power is the rate of energy transfer.
What does rate mean?
Section titled “What does rate mean?”WHenever we have a rate of something, it means ‘how much happens in a certain time’?
For a ‘unit rate’ of something, it means ‘how much happens in one second’.
It therefore also means that the units area going to be ‘something per second’
(e.g. joules per second,
Formula
Section titled “Formula”We can calculate power using the formula:
Or, in symbols:
Where:
is the power, in watts, is the energy transferred, in joules, is the time taken, in seconds,
Rearranged versions
Section titled “Rearranged versions”To calculate energy transferred:
To calculate time taken: