Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7×10^-8 ohm meter.
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R=?
p= 1.7×10^-8 ohm metre
diameter = 0.50mm
L=1.0 km=1000 m
R=pL/A
R=1.7×10^-8×1000/π(0.5/2)²
R=1.7×10^-8+3/π(0.5/2)²
R=1.7×10^-5/π(.25)²
R=1.7×10^-5/(.196)
R=8.6734×10^-5 ohm
p= 1.7×10^-8 ohm metre
diameter = 0.50mm
L=1.0 km=1000 m
R=pL/A
R=1.7×10^-8×1000/π(0.5/2)²
R=1.7×10^-8+3/π(0.5/2)²
R=1.7×10^-5/π(.25)²
R=1.7×10^-5/(.196)
R=8.6734×10^-5 ohm
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