# Ohm's Law

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It appears on the amateur radio exams as a method of calculating electric power, usually in one of these three forms:

1. $P=E×I$
2. $P={I}^{2}×R$
3. $P=\frac{{E}^{2}}{R}$

## Try it!

Fill in any two values.

watts
volts
amperes
ohms