The unit of inductance in the centimeter-gram-second electromagnetic system of units. Symbol, abH. A circuit has an inductance of 1 abhenry if a current changing at the rate of 1 abampere per second induces an electromotive force of 1 abvolt in it. By the 1940s use of this unit was being discouraged. One abhenry = 1 × 10−9 henry.

According to the current national standard in the United States¹, the abhenry is not to be used. The henry should be used instead.

1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.


For an excellent history of the development of the electric and magnetic units up to 1913, see U. S. Bureau of Standards Circular 60.

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