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In the International System of Units (SI), the henry (H) is the unit of electrical inductance. It is named after Joseph Henry (1797--1878), an American scientist who discovered electromagnetic induction.
In a circuit where the current is changing at a constant rate of one ampere per second (A/s), an inductance of 1 H results in the generation of one volt (V) of potential difference across an inductor.
Faraday's law characterizes the voltage drop across an inductor as VL = L di/dt where VL = voltage drop (V), L = inductance (H, 1H = 1 V.s).
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