Henry (unit)

In physics, and electronics, the henry (symbol H) is the SI unit of inductance.^[1] It is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction. (In England, Michael Faraday (1791–1867) discovered the same thing independently. They discovered it at about the same time.)^[2] The magnetic permeability of a complete 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. People do not capitalize unit names.

1. ↑ Rowlett, Russ. "How Many? A Dictionary of Units of Measurement". University of North Carolina at Chapel Hill. Archived from the original on 2016-08-29. Retrieved 2011-12-27.
2. ↑ Herbert S. Bailey, Jr. "A Princeton Companion". Archived from the original on 2011-08-12. Retrieved 2011-12-27.