In electromagnetism and electronics, inductance is the property of a conductor by which a change in current flowing through it induces (creates) a voltage (electromotive force) in both the conductor itself (self-inductance) and in any nearby conductors (mutual inductance). These effects are derived from two fundamental observations of physics: First, that a steady current creates a steady magnetic field (Oersted’s law), and second, that a time-varying magnetic field induces voltage in nearby conductors (Faraday’s law of induction). According to Lenz’s law, a changing electric current through a circuit that contains inductance induces a proportional voltage, which opposes the change in current (self-inductance). The varying field in this circuit may also induce an e.m.f. in neighbouring circuits (mutual inductance). The term ‘inductance’ was coined by Oliver Heaviside in February 1886. It is customary to use the symbol L for inductance, in honour of the physicist Heinrich Lenz. In the SI system the measurement unit for inductance is the henry (symbol: H), named in honor of the scientist who discovered inductance independently of, but not before, Faraday, Joseph Henry.