Question

THE SUBSTATION BUSBAR IS MADE UP OF 2 INCHES ROUND COPPER BARS 240in LONG.

WHAT IS THE RESISTANCE OF EACH BAR IF RESISTIVITY IS 1.724 x 10-6 OHM-CM?

Answer 1

R=2in=$0.0254\times2=0.0508m$

L=240 in $=240\times0.0254=6.096m$

$\rho=1.724\times10^{-8}\Omega m$

We know that

$R=\frac{\rho L}{A}$

Put value

$$R=\frac{1.724\times10^{-8}\times6.096}{3.14\times0.0508^2}=1.296\times10^{-05}\Omega$$