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henry

For the meaning of any metric prefix, go here.

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).