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Electrical resistance and conductance: Difference between revisions

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] ] ] ] ]

'''Electrical resistance''' is the ratio of the ] (i.e. voltage) across an electric component (such as a ]) to the ] passing through it:

:<math>R=V/I</math>

(where V is the voltage and I the current)

It is thus a measure of the component's opposition to the flow of ]. Electrical resistance is usually denoted by symbol ''R''. The ] unit for electrical resistance is ]. Its ] quantity is '''electrical conductance''' measured in ].

For a wide variety of materials and conditions, the electrical resistance does not depend on the amount of current flowing or the amount of applied ]: the two are ] and the proportionality constant is the electrical resistance. This is the content of ].

Specific electrical resistance, a measure of a material's ability to oppose the flow of electric current, is also known as ].

The resistance ''R'' of a wire can be computed as

:<math> R = {L \rho \over A} \; , </math>

where ''L'' is the length of the wire, ''A'' is the cross-sectional area and &rho; is the electrical resistivity of the material.

See ] for the more information about the physical mechanisms for conduction in materials.

Some materials exhibit the property known as ].

==See also==
*]
*]

Revision as of 02:18, 26 January 2004

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