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The unit of inductance and permanence in SI. Symbol, H. The self- or mutual inductance of a closed loop is 1 henry if a current of 1 ampere gives rise to a magnetic flux of 1 weber.

In terms of the weber, a derived unit, the henry is a fraction, weber over ampere,

or in terms of base units only,a fraction. The numerator is meters squared times kilograms. The denominator is seconds squared times amperes squared.

The henry was adopted in 1893 by the International Electrical Congress. It is named for the American scientist and engineer Joseph Henry (1797 – 1878).

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