henry

(H)
   the SI unit of electric inductance. A changing magnetic field induces an electric current in a loop of wire (or in a coil of many loops) located in the field. Although the induced voltage depends only on the rate at which the magnetic flux changes, measured in webers per second, the amount of the current depends also on the physical properties of the coil. A coil with an inductance of one henry requires a flux of one weber for each ampere of induced current. If, on the other hand, it is the current which changes, then the induced field will generate a potential difference within the coil: if the inductance is one henry a current change of one ampere per second generates a potential difference of one volt. The henry is a large unit; inductances in practical circuits are measured in millihenrys (mH) or microhenrys (µH). The unit is named for the American physicist Joseph Henry (1797-1878), one of several scientists who discovered independently how magnetic fields can be used to generate alternating currents. The plural is sometimes spelled henrys, but in English it is correct to spell it henries.

Dictionary of units of measurement. 2015.

Look at other dictionaries:

  • henry — henry …   Dictionnaire des rimes

  • Henry — is an English male given name and a surname, derived from Heinrich of Germanic origin. Equivalents in other languages are Henrik (Scandinavian), Eanruig (Scots Gaelic), Enrico (Italian), Henri (French), Enrique (Spanish), Henrik (Hungarian),… …   Wikipedia

  • Henry IV — • German king and Holy Roman Emperor (1050 1108) Catholic Encyclopedia. Kevin Knight. 2006. Henry IV     ♦ Henry IV      …   Catholic encyclopedia

  • Henry — hace referencia a: Contenido 1 Como nombre 2 Como apellido 2.1 botánica 3 Lugares 4 Otros …   Wikipedia Español

  • Henry VI — • German king and Holy Roman Emperor (1165 1197) Catholic Encyclopedia. Kevin Knight. 2006. Henry VI     Henry VI     † …   Catholic encyclopedia

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  • Henry V — • German king and Holy Roman Emperor (1081 1125) Catholic Encyclopedia. Kevin Knight. 2006. Henry V     Henry V     † …   Catholic encyclopedia

  • Henry I — may refer to:* Henry I of Germany, the Fowler (876–936). * Henry I, Duke of Bavaria (c. 920–955). * Henry I of Austria (died 1018). * Henry II, Holy Roman Emperor (972–1024), called Henry I by historians who don t recognise Henry the Fowler as… …   Wikipedia

  • Henry J — in Japan Henry J Modellauto …   Deutsch Wikipedia

  • Henry J — Henry J …   Википедия

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