👉 In physics, reactance is a measure of the opposition that an electrical conductor experiences to the flow of current through it. It is defined as the ratio of the reactive resistance (or reactance) of the conductor to its inductive reactance. The reactance of a conductor depends on two factors: its size and type. The larger the conductor, the greater the reactance, and the more complex its shape. The smaller the conductor, the less it will react to changes in current flow,