Electrical Engineering ⇒ Topic : Factors Upon Which Resistance Depends
Factors Upon Which Resistance Depends
The resistance R of a conductor
(1) is directly proportional to its length i.e.
(2) is inversely proportional to its area of X-section i. e
(3) depends upon the nature of material.
(4) depends upon temperature.
From the first three points (leaving temperature for the time being), we have
where p (Greek letter 'Rho') is a constant and is known as resistivity or specific resistance of the material. Its value depends upon the nature of the material.
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