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.