In physics, and electronics, the henry (symbol H) is the SI derived unit of inductance. It is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as Michael Faraday (1791–1867) in England. The magnetic permeability of the vacuum is 4π×10⁻⁷ H/m (henry per meter).

The National Institute of Standards and Technology provides guidance for American users of SI to write the plural as henries.

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. Other equivalent combinations of SI units are as follows:

where

A = ampere
C = coulomb
F = farad
J = joule
kg = kilogram
m = meter
s = second
Wb = weber
V = volt
Ω = ohm.

Henry may refer to:

Most people with the name Henry are listed at:

Unit may refer to:

Lu Han (simplified Chinese: 卢汉; traditional Chinese: 盧漢; pinyin: Lú Hàn) (1895–1974) was a KMT general of Yi ethnicity.

His alma mater was Yunnan military academy. He was commander of the First Group Army in the Second Sino-Japanese War.

Lu Han, as a member of the Kuomintang, provided support to the Viet Nam Quoc Dan Dang. Lu Han commanded Chinese forces occupying Indochina after the Japanese surrendered.

In 1946 his forces occupied northern Vietnam for six months, between the Japanese surrender and the return of French colonial forces to the area. He was a cousin of Long Yun and succeeded him as governor of Yunnan from 1945-1949. Lu Han defected to the Communists in 1949.

Henry Ford (July 30, 1863 – April 7, 1947) was an American industrialist, the founder of the Ford Motor Company, and sponsor of the development of the assembly line technique of mass production. His introduction of the Model T automobile revolutionized transportation and American industry. As owner of the Ford Motor Company, he became one of the richest and best-known people in the world. Ford spent most of his life making headlines, good, bad, but never indifferent. Celebrated as both a technological genius and a folk hero, Ford was the creative force behind an industry of unprecedented size and wealth that in only a few decades permanently changed the economic and social character of the United States. He is credited with "Fordism": mass production of inexpensive goods coupled with high wages for workers. Ford had a global vision, with consumerism as the key to peace. His intense commitment to systematically lowering costs resulted in many technical and business innovations, including a franchise system that put dealerships throughout most of North America and in major cities on six continents. Ford left most of his vast wealth to the Ford Foundation but arranged for his family to control the company permanently.