Difference between revisions of "Electric conductivity"
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| − | '''Electric conductivity''' (symbol: '''''σ''''') is the [[physical quantity]] which characterizes the ability of a material to conduct an [[electric current]]. It is defined such that the [[electric current density]] '''''J'''' is equal to the electric conductivity multiplied by the [[electric field strength]] '''''E''''':<ref>{{Electropedia|entry=conductivity|id=121-12-03|accessdate=2010-12-28}}.</ref> | + | {{TOCright}} |
| + | '''Electric conductivity''' (symbol: '''''σ''''') is the [[physical quantity]] which characterizes the ability of a material to conduct an [[electric current]]. It is defined such that the [[electric current density]] '''''J''''' is equal to the electric conductivity multiplied by the [[electric field strength]] '''''E''''':<ref>{{Electropedia|entry=conductivity|id=121-12-03|accessdate=2010-12-28}}.</ref> | ||
:'''''J''''' = ''σ'''E''''' | :'''''J''''' = ''σ'''E''''' | ||
Electric conductivity may be either a [[scalar]] quantity (for isotropic materials, the majority of cases) or a rank-2 [[tensor]] (for [[Anisotropy|anisotropic]] materials, such as [[graphite]] or crystalline [[gallium]]). The inverse of electric conductivity is the [[electric resistivity]] ''ρ''. | Electric conductivity may be either a [[scalar]] quantity (for isotropic materials, the majority of cases) or a rank-2 [[tensor]] (for [[Anisotropy|anisotropic]] materials, such as [[graphite]] or crystalline [[gallium]]). The inverse of electric conductivity is the [[electric resistivity]] ''ρ''. | ||
Latest revision as of 09:41, 28 December 2010
Electric conductivity (symbol: σ) is the physical quantity which characterizes the ability of a material to conduct an electric current. It is defined such that the electric current density J is equal to the electric conductivity multiplied by the electric field strength E:[1]
- J = σE
Electric conductivity may be either a scalar quantity (for isotropic materials, the majority of cases) or a rank-2 tensor (for anisotropic materials, such as graphite or crystalline gallium). The inverse of electric conductivity is the electric resistivity ρ.
Notes and references
Notes
References
- ↑ conductivity. In Electropedia: International Electrotechnical Vocabulary (IEC 60050); International Electrotechnical Commission: Geneva, <http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=121-12-03>. (accessed 28 December 2010).
External links
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See also the corresponding article on Wikipedia. |
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