The unit of inductance is henry. Inductance is a property of an electrical circuit that opposes any change in current flowing through it. It is defined as the ratio of the magnetic flux through a circuit to the current flowing in the circuit. The unit is named after Joseph Henry, an American scientist who discovered electromagnetic induction independently of Michael Faraday. The symbol for inductance is H, and one henry is defined as the amount of inductance that will produce an electromotive force of one volt when the current through the inductor changes at a rate of one ampere per second.