An inductor is also called as a coil or reactor. The drop of voltage across the inductor is proportional to the rate-change of the current. Any change in the current through an inductor creates a changing flux, inducing a voltage across the inductor. Ohm's law for an inductor, Instantaneous voltage across the inductor (v) is the product of Inductance in Henrys L and (di/dt). Here, di/dt is the Instantaneous rate of current change.