By what factor is the resistance of a copper wire changed when its temperature is increased from 20 $\degree$C to 120 $\degree$C? The temperature coefficient of resistivity for copper = 3.9 x 10^-3 ( $\degree$C)^-1. A)0.72 B)1.06 C)1.39 D)1.44

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Quizplus · Accepted Answer

The resistance of a conductor changes with temperature according to the formula R = R0(1 + αΔT), where α is the temperature coefficient of resistivity and ΔT is the change in temperature. For copper, with α = 3.9 x 10^-3 and ΔT = 100°C (from 20°C to 120°C), the factor is 1 + (3.9 x 10^-3 * 100) = 1.39.

By What Factor Is the Resistance of a Copper Wire °\degree°

By What Factor Is the Resistance of a Copper Wire $\degree$