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> | + | 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: |
| + | :''V''<sub>90</sub> = (''K''{{sub|J–90}}/''K''{{sub|J}}) V = [1 + 1.9(2.5){{e|−8}}] V | ||
| + | The '''international volt''' (symbol: '''V<sub>int</sub>''') is now obsolete. | ||
==Definition== | ==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]].<ref>CIPM (1946), Resolution 2.</ref> | 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]].<ref>CIPM (1946), Resolution 2.</ref> | ||
| + | |||
| + | ===Conventional volt=== | ||
| + | |||
| + | ==Realization== | ||
| + | |||
| + | ==History== | ||
==Notes and references== | ==Notes and references== | ||
Revision as of 20:48, 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:
- V90 = (KTemplate:Sub/KTemplate:Sub) 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.[1]
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
- ↑ CIPM (1946), Resolution 2.
External links
 |
See also the corresponding article on Wikipedia. |
- volt at Sizes.com
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This page is currently licensed under the Creative Commons Attribution 3.0 Unported license and any later versions of that license. |
