Question

Determine the resistance of a busbar made up of copper if the is 10 meters long and the cross section is 4×4 cm2. Use 1.7241 micro ohm -cm as the resistivity

Answer 1

Length $l$ $=10 m$

Area of cross-section $A=4×4cm^2$

$A=16×10^{-4} m^2$

Resistivity$\rho$ $=1.7241 micro\Omega$ $cm$

$\rho$ $=1.7241×10^{-8} \Omega$ $m$

Resistance $R =\frac{\rho.l}{A}$

$R=\frac{1.72241×10^{-8}×10}{16×10^{-4}}$

$R=1.0775×10^{-4}\Omega$