Find the temperature at which the resistance of a conductor increases by 25% of its value at 27 °C. The temperature coefficient of resistance of the…

$\displaystyle R_{2}=R_{1}+25 \%$ of $\displaystyle R_{1}=1.25 R_{1}$ Temperature coefficient of resistance: $\displaystyle \alpha=\frac{R_{2}-R_{1}}{R_{1} \cdot \Delta T}$ $\displaystyle T_{2}-27=\frac{1.25 R_{1}-R_{1}}{R_{1} \times 2 \times 10^{-4}}$ $\displaystyle T_{2}=1277^{\circ} \mathrm{C}$