A metal wire has a resistance of 10.00 W at a temperature of 20 $\degree$C.If the same wire has a resistance of 10.55 W at 90 $\degree$C,what is the resistance when its temperature is -20 $\degree$C?
A)0.70 W
B)9.69 W
C)10.31 W
D)13.8 W

Question

Quizplus · Accepted Answer

The resistance of a metal wire changes with temperature according to the formula R = R0(1 + α(T - T0)), where α is the temperature coefficient of resistance. Using the given resistances at 20°C and 90°C, we can calculate α and then find the resistance at -20°C.

A Metal Wire Has a Resistance of 10 °\degree° CIf the Same Wire Has a Resistance of 10

A Metal Wire Has a Resistance of 10 $\degree$ CIf the Same Wire Has a Resistance of 10