Power Printable

Power

The rate at which Energy is transformed; or the rate at which Work is done $P=\frac{\Delta E}{\Delta t}$ Power is measured in Watts ($W$) (Joules per second) In this case, the amount of work is the same, only the time is changing.

Energy Ratings

The energy used (transformed) by an electrical appliance, $\Delta E$ the amount of electrical energy used is usually measured in kilowatt hours ($kWh$)

Electrical Energy

$\Delta E=P\Delta t$

Cost

$\cos t=\Delta E\cdot rate$