Electrically conductive | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-13

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity


00:01:09 1 Definition
00:01:18 1.1 Ideal case
00:04:50 1.2 General scalar case
00:06:51 1.3 Tensor resistivity
00:21:20 2 Causes of conductivity
00:21:30 2.1 Band theory simplified
00:23:55 2.2 In metals
00:25:48 2.3 In semiconductors and insulators
00:27:25 2.4 In ionic liquids/electrolytes
00:28:20 2.5 Superconductivity
00:30:03 2.6 Plasma
00:33:00 3 Resistivity and conductivity of various materials
00:36:23 4 Temperature dependence
00:36:33 4.1 Linear approximation
00:38:47 4.2 Metals
00:42:24 4.3 Semiconductors
00:45:02 5 Complex resistivity and conductivity
00:45:09 6 Resistance versus resistivity in complicated geometries
00:46:38 7 Resistivity density products
00:48:48 8 See also
00:50:08 9 Notes



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SUMMARY
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Electrical resistivity (also known as specific electrical resistance, or volume resistivity) is a fundamental property of a material that quantifies how strongly that material opposes 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).  As an 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, and measures a material's ability to conduct an electric current. It is commonly represented by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) or γ (gamma) are also occasionally used. Its SI unit is siemens per metre (S/m).