Whether you are a seasoned veteran or a newbie to electronics an Ohms law chart is something that is always good to have around.

The Ohm Law formulas above show the relationship between Voltage, Amps, Watts, and Ohms. If you know two of them, you can calculate the other two.

P=Watts - The rate of energy conversion
R=Ohms - The electrical resistance
I=Amps - The amount of electricity passing through a point
E=Volts - The potential electrical difference between two points

Voltage

V=I*R
V=√(P*R)
V=P/I

Resistance

P/I²
E/I
E²/P

Current

E/R
√(P/R)
P/E

Power

I*I²/R
E*I
E²/R