A $12\mathrm{.}0$m lenghh of copper wore has a resistance of $1\mathrm{.}50$ohms.

How long must an aluminium wire with the same cross sectional area be to have the same resistance?

$($resistivities of copper and aluminium are $1\mathrm{.}72$X$10^-8$ and $2\mathrm{.}82$X$10^-8$ respectively

Answer rating: 100% (QA)

To find the length of the aluminum wire that would have the same resistance as the 120m copper wire ... View the full answer