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Encyclopedia > Electric conductance

Electrical conductance is an electrical phenomenon where a material contains movable particles with electric charge, which can carry electricity. When a difference of electrical potential is placed across a conductor, its movable charges flow, and an electric current appears.

The SI unit of electrical conductance is the siemens, (named after Werner von Siemens)

SI electromagnetism units

edit  (http://en.wikipedia.org/w/index.php?title=Template:SI_electromagnetism_units&action=edit)

Name Symbol Dimensions Quantity
ampere (SI base unit) A A Current
coulomb C A�s Electric charge, Quantity of electricity
volt V J/C = kg�m2�s−3�A−1 Potential difference
ohm Ω V/A = kg�m2�s−3�A−2 Resistance, Impedance, Reactance
ohm metre Ω�m kg�m3�s−3�A−2 Resistivity
farad F C/V = kg−1�m−2�A2�s4 Capacitance
farad per metre F/m kg−1�m−3�A2�s4 Permittivity
siemens S Ω−1 = kg−1�m−2�s3�A2 Conductance, Admittance, Susceptance
siemens per metre S/m kg−1�m−3�s3�A2 Conductivity
weber Wb V�s = kg�m2�s−2�A−1 Magnetic flux
tesla T Wb/m2 = kg�s−2�A−1 Magnetic flux density
ampere per metre A/m m−1�A magnetic induction
ampere-turns per weber A/Wb kg−1�m−2�s2�A2 Reluctance
henry H V�s/A = kg�m2�s−2�A−2 Inductance
henry per metre H/m kg�m�s−2�A−2 Permeability
(dimensionless) - - Magnetic susceptibility Results from FactBites:

 Herguth - TOC - Electrical Conductivity/ Dielectric Strength (453 words) The unit of electrical conductivity involves the reciprocal of resistance (1/ohm or mho) and a distance, and is mho cm-1. Electrical conductivity and dielectric breakdown voltage of oils are important in lubricated components subjected to stray or self-generated electric currents. Electrical conductivity or its reciprocal, resistance, is measured with an apparatus which determines the current flowing through an oil between immersed electrodes at a constant distance apart.
 Electrical conductivity - Wikipedia, the free encyclopedia (690 words) Electrical conductivity or specific conductivity is a measure of a material's ability to conduct an electric current. The conductivity of a semiconductor is generally intermediate, but varies widely under different conditions, such as exposure of the material to electric fields or specific frequencies of light, and, most important, with temperature and composition of the semiconductor material. In metals, electrical conductivity decreases with increasing temperature, whereas in semiconductors, electrical conductivity increases with increasing temperature.
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