Chapter 17 - Electric Current and Resistance - Learning Path Questions and Exercises - Multiple Choice Questions - Page 617: 23

(b) the copper wire

Incase the dimensions of both aluminium wire and copper wire are same then the resistance of aluminium will be more its resistivity is more than copper resistivity. Aluminium=$2.82\times10^{-8}$ Copper = $1.7\times10^{-8}$ So power dissipation will be more in copper as power output is given by $\frac{V^{2}}{R}$.