The attrition of a accustomed article depends primarily on two factors: What actual it is fabricated of, and its shape. For a accustomed material, the cross-sectional breadth is inversely proportional to the resistance; for example, a blubbery chestnut wire has lower attrition than an otherwise-identical attenuate chestnut wire. Also, for a accustomed material, the attrition is proportional to the length; for example, a continued chestnut wire has college attrition than an otherwise-identical abbreviate chestnut wire. The attrition R and conductance G of a aqueduct of compatible cantankerous section, therefore, can be computed as
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