Difference between revisions of "Electric resistivity"
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| − | '''Electric resistivity''' (symbol: '''''ρ''''') is the inverse of [[electric conductivity]], and so is formally [[ | + | '''Electric resistivity''' (symbol: '''''ρ''''') is the inverse of [[electric conductivity]], and so is formally [[electric field strength]] divided by [[electric current density]].<ref>{{Electropedia|entry=(volume) DC resistivity|id=212-11-16|accessdate=2011-04-04}}.</ref><ref>{{GoldBook|name=resistivity, ''ρ''|id=R05316|accessdate=2011-04-04}}.</ref> It is often described by reference to the [[electric resistance]] of a metal wire: the resistivity is the resistance of a wire multiplied by its cross-sectional area divided by its length. |
| + | :''ρ'' = '''''E'''''·'''''J'''''<sup>−1</sup> = ''RA''/''l'' | ||
| + | Electric resistivity is measured in ohm metres ({{nowrap|Ω m}}) or, more usually, in the [[CGS unit]] of ohm centimetres ({{nowrap|Ω cm}}): {{nowrap|1=1 Ω m =}} {{nowrap|100 Ω cm}}. It 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]]). | ||
| + | |||
| + | ==See also== | ||
| + | *[[Data:Electric resistivities of the elements|Electric resistivities of the elements]] | ||
==Notes and references== | ==Notes and references== | ||
Latest revision as of 06:46, 14 April 2011
Electric resistivity (symbol: ρ) is the inverse of electric conductivity, and so is formally electric field strength divided by electric current density.[1][2] It is often described by reference to the electric resistance of a metal wire: the resistivity is the resistance of a wire multiplied by its cross-sectional area divided by its length.
- ρ = E·J−1 = RA/l
Electric resistivity is measured in ohm metres (Ω m) or, more usually, in the CGS unit of ohm centimetres (Ω cm): 1 Ω m = 100 Ω cm. It 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).
See also
Notes and references
Notes
References
- ↑ (volume) DC resistivity. In Electropedia: International Electrotechnical Vocabulary (IEC 60050); International Electrotechnical Commission: Geneva, <http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=212-11-16>. (accessed 4 April 2011).
- ↑ resistivity, ρ, <http://goldbook.iupac.org/R05316.html> (accessed 4 April 2011), Compendium of Chemical Terminology Internet edition; International Union of Pure and Applied Chemistry (IUPAC).
Further reading
- Rossiter, Paul L. The electrical resistivity of metals and alloys; Cambridge Solid State Science Series; University Press: Cambridge, 1991. ISBN 0521408725.
- Dyos, Gordon T.; Farrell, Trevor Electrical resistivity handbook; Peter Peregrinus, 1992.
- CRC handbook of electrical resistivities of binary metallic alloys; Schröder, Klaus, Ed.; CRC Press, 1983. ISBN 0849335205.
External links
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See also the corresponding article on Wikipedia. |
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