Electric conductivity | Wikipedia audio article
Channel: wikipedia tts
Date: 28/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity


00:01:11 1 Definition
00:01:20 1.1 Ideal case
00:04:46 1.2 General scalar case
00:06:45 1.3 Tensor resistivity
00:13:10 2 Causes of conductivity
00:20:54 2.1 Band theory simplified
00:21:04 2.2 In metals
00:23:18 2.3 In semiconductors and insulators
00:25:08 2.4 In ionic liquids/electrolytes
00:26:43 2.5 Superconductivity
00:27:36 2.6 Plasma
00:29:15 3 Resistivity and conductivity of various materials
00:32:09 4 Temperature dependence
00:35:25 4.1 Linear approximation
00:35:35 4.2 Metals
00:37:46 4.3 Semiconductors
00:41:16 5 Complex resistivity and conductivity
00:43:51 6 Resistance versus resistivity in complicated geometries
00:43:58 7 Resistivity-density product
00:45:24 8 See also
00:47:30 9 Notes
00:48:46 10 References



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SUMMARY
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Electrical resistivity (also called specific electrical resistance or volume resistivity) and its converse, electrical conductivity, is a fundamental property of  a material that quantifies how strongly it resists or conducts the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-metre (Ω⋅m).  For example, if a 1 m × 1 m × 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.
Electrical conductivity or specific conductance is the reciprocal of electrical resistivity. It represents a material's ability to conduct  electric current. It is commonly signified by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) and γ (gamma) are sometimes used. The SI unit of electrical conductivity is siemens per metre (S/m).