henry

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.