Is the correct equation that relates to the electrical resistivity of a conducting material to its resistance:(adsbygoogle = window.adsbygoogle || []).push({});

p = RS/l

p = is the electrical resistivity

R = is the resistance of the material

S = is the cross-sectional area

l = is the length of the specimen

if I'm using the right formula, would my answer to this question be correct?

A potential difference of 1.5V exists across the ends of a copper wire of length 2.0m and uniform radius 0.40mm. Calculate the current in the wire.

I've been given the resistivity of copper as 1.7 x 10^-4 ohms.meter

[Answer]

p = RS/l

= (1.7 x 10^-4) x 0.40mm / 2.0m

= 0.0007 x 0.0004 / 2.0

= 0.00000014

corecto?

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# Electrical Resistivity Equation

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