In general, assuming temperature of a conductor is constant, the resistance of a conductor is affected by
1) length (L) – [L increases, R increases]
2) cross-sectional area (A) – [A increases, R decreases]
3) resistivity (p) = [p increases, R increases]
As R is directly proportional to L and p, and is inversely proportional to A,
R = pL/A
MCQ questions from Olevel
There are times when using the formula is more appropriate.
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