Voltage is measured in *volts (V)*. Current is measured in *Amperes (Amps)*. Resistance is measured in *Ohms (Ω)*. These three components of circuits are related to each other. The relationship between *voltage*,* current*, and *resistance* is defined by

Voltage (V) = Current (I) x Resistance (R).

This equation is known as *Ohm’s Law*. If we know any two of the three quantities, we can calculate the missing one.