Watt's Law

Watt's Law, sometimes called the Power Law, describes the relationship between power ( $P$ ), current ( $I$ ), and voltage ( $V$ ):

$P=IV$

Given tha values for any two variables, we solve for the third, so that:

$V=\frac{P}{I}$

And:

$I=\frac{P}{V}$

Power and Watts

Power is measured in watts. One watt ( $W$ ) is equal to one joule ( $J$ ) per second ( $s$ ), or $W = \frac{J}{s}$ . Another way to put it is, a watt is the amount of electricity required to accelerate 1kg by 1 meter per second squared (a joule) over 1 second. In other words, a watt is "how much work can be done per second".