Inductor: An inductor is a passive component that is used in most power electronic circuits to store energy in the form of magnetic energy when electricity is applied to it.
One of the key properties of an inductor is that it impedes or opposes any change in the amount of current flowing through it.
Whenever the current across the inductor changes it either acquires charge or loses the charge in order to equalize the current passing through it.
Inductors don't have a functional polarity and work equally in either direction.