The henry (symbol H) is the SI unit of inductance. If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry.
The henry has dimensions V·A^{1}·s = m²·kg·s^{2}·A^{2} in SI units.
The unit is named after the American scientist Joseph Henry.
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