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By what factor is the resistance of a copper wire changed when its temperature is increased from 30.0°C to 115°C? The temperature coefficien
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Answer:
The resistance of the wire increases by a factor of 1.3315
Explanation:
The relationship between resistance of a wire and its temperature change is given by
R = R₀ (1 + αΔT)
R = Resistance at any other temperature.
R₀ = Resistance at a reference temperature.
α = temlerature Coefficient of resistivity = 3.9 × 10⁻³ (°C)⁻¹
ΔT = difference in twmlerature between the current temperature and the reference temperature = 115 – 30 = 85°C
R = R₀ (1 + (0.0039)(85))
R = R₀ (1.3315)
R = 1.3315 R₀
(R/R₀) = 1.3315
Explanation:
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