Difference between revisions of "Volt"
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The '''volt''' (symbol: '''V''') is the [[SI unit]] of [[electric potential difference]] and [[electromotive force]]. It is named after the Italian physicist [[Alessandro Volta]] (1745–1827). | The '''volt''' (symbol: '''V''') is the [[SI unit]] of [[electric potential difference]] and [[electromotive force]]. It is named after the Italian physicist [[Alessandro Volta]] (1745–1827). | ||
| − | A similar unit, used for practical measurements of potential difference, is the '''conventional volt''' (symbol: '''''V''<sub>90</sub>''').<ref group="note">''V''<sub>90</sub> is considered to be a [[physical constant]], hence the use of italics for the symbol.</ref> The 2006 CODATA recommended value for ''V''<sub>90</sub> is: | + | A similar unit, used for practical measurements of potential difference, is the '''conventional volt''' (symbol: '''''V''<sub>90</sub>''').<ref group="note">''V''<sub>90</sub> is considered to be a [[physical constant]], hence the use of italics for the symbol.</ref> The 2006 CODATA recommended value for ''V''<sub>90</sub> is:<ref>{{CODATA 2006}}.</ref> |
| − | :''V''<sub>90</sub> = (''K'' | + | :''V''<sub>90</sub> = (''K''<sub>J–90</sub>/''K''<sub>J</sub>) V = [1 + 1.9(2.5){{e|−8}}] V |
The '''international volt''' (symbol: '''V<sub>int</sub>''') is now obsolete. | The '''international volt''' (symbol: '''V<sub>int</sub>''') is now obsolete. | ||
Revision as of 20:50, 30 July 2010
The volt (symbol: V) is the SI unit of electric potential difference and electromotive force. It is named after the Italian physicist Alessandro Volta (1745–1827).
A similar unit, used for practical measurements of potential difference, is the conventional volt (symbol: V90).[note 1] The 2006 CODATA recommended value for V90 is:[1]
- V90 = (KJ–90/KJ) V = [1 + 1.9(2.5) × 10−8] V
The international volt (symbol: Vint) is now obsolete.
Contents
Definition
The volt is defined as the potential difference between two points on a conductor when the current flowing is one ampere and the power dissipated is one watt.[2]
Conventional volt
Realization
History
Notes and references
Notes
- ↑ V90 is considered to be a physical constant, hence the use of italics for the symbol.
References
- ↑ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>.
- ↑ CIPM (1946), Resolution 2.
External links
 |
See also the corresponding article on Wikipedia. |
- volt at Sizes.com
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