The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation

Assessment: WAEC SSCE - Physics - 2011 (Objective) Subject: Physics

Question 1 Report

\(\mathit{P} = \frac{RA}{l}\)

\(\mathit{P} = \frac{l}{RA}\)

\(\mathit{P} = \frac{Rl}{A}\)

\(\mathit{P} = \frac{R}{Al}\)

Answer Details

The resistivity, \(\mathit{P}\), of a material is a measure of its ability to resist the flow of electric current. The resistance, R, of a material is directly proportional to its length, l, and inversely proportional to its cross-sectional area, A. Therefore, we can say that \(\mathit{P} = \frac{RA}{l}\), as this equation combines the resistance, length, and cross-sectional area to give the resistivity of the material.

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The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation

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