A copper wire and an aluminium wire each have length and the same cross-sectional area

PHYSICS · Subjective · CBSE · Physics · Current Electricity · Current Electricity

Problem

A copper wire and an aluminium wire each have length

1\,\text{m}

and the same cross-sectional area. The resistivity of copper is

1.7\times10^{-8}\,\Omega\,\text{m}

, while that of aluminium is

2.7\times10^{-8}\,\Omega\,\text{m}

. Calculate the ratio

\dfrac{R_{\text{Al}}}{R_{\text{Cu}}}

of their resistances. Which wire would you prefer for long-distance power transmission?