A conductor such as a metal has high conductivity, and an insulator like glass, or the vacuum, has low conductivity. A semiconductor has a conductivity that may vary with conditions, such as exposure of the material to certain frequencies of light.
Electrical conductivity is the reciprocal of electrical resistivity (ohms). Its SI derived unit is the siemens (named after Werner von Siemens) per meter (A2s3m-3kg-1). It is the ratio of the current density to the electric field strength. This applies also to the electrolytic conductivity of a fluid.
See also: electrical conduction
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