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The volt is defined as the [[potential difference]] across a conductor when a [[Electric current|current]] of one [[ampere]] dissipates one [[watt]] of [[power (physics)|power]].<ref>[http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf BIPM SI Brochure: Appendix 1, p. 144]</ref>

 

Since 1990 the volt is maintained internationally for practical measurement using the [[Josephson effect]], where a conventional value is used for the [[Josephson constant]], fixed by the 18th [[General Conference on Weights and Measures]] as

 

{{SI unit lowercase|Alessandro Volta|volt|V}}-->

 

<references />

 

* [[Voltmeter]]

* [[Vattium]]

 

* [http://video.google.com/videoplay?docid=5645396659673218353&q=Physics+for+Future+Presidents+Electricity&total=5&start=0&num=10&so=0&type=search&plindex=0#0h20m30s Google Video Lecture about Electricity and Volt by Richard A. Muller]

* [http://www.aqdi.com/rms.htm What is RMS?]-->

 

{{Unitates SI}}

[[Categoria:Unitates physicae]]