Difference between revisions of "Electric conductivity"
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Revision as of 09:39, 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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