The fundamental relationship between the three important electrical quantities: Georg Simon Ohm discovered current, voltage, and resistance. It is derived from the Ohm’s theory. One statement of Ohm’s law is the current through a resistor is proportional to the voltage across the resistor.
Ohm’s law holds for most circuit components, but it is not universally applicable. Ohm’s law works for AC circuits with inductors, capacitors, and resistances. Capacitance is the capability of an instrument to store electronic charge. An electronic component that stores electric charge is called a capacitor.