Question

What is the resistance of a copper bus bar 9.15 meter long and 7.62 cm by 1.27

cm in cross section? Use 1.78 μΩ-cm specific resistance for copper.

Answer 1

$l=9.15m=915cm$

Area, $A=7.62\times 1.27=9.677cm^2$

$\rho=1.78\times 10^{-6}\Omega-cm$

$Resistance, R=\rho \frac{l}{A}=1.78\times 10^{-6} \frac{915}{9.677}=1.683\times 10^{-4} \Omega$