What is Ohm's Law?

The relationship between Resistance, Voltage and Power

Ohm's law is a simple equation that shows the relationship between resistance, voltage and current through a metal wire, or some other type of resistive material. In mathematical terms, Ohm's law is written as:
I = V/R ,
where I is the current (Amps), V is the voltage (Volts), and R is the resistance (Ohms).



Ohm's law can also show the relationship between resistance, voltage and power using the following equation:
P = V 2/R ,
where P is the power (Watts), V is the voltage (Volts), and R is the resistance (Ohms).