Created by StemPy LabA metal wire is heated. What happens to the relaxation time of its electrons, and to its resistivity?
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← A wire is drawn through a die, so that its length becomes 3 times as large. Its volume does not change. How many times larger is its resistance?The copper winding of a motor has a resistance of 12.4 Ω at 20 °C. After the motor runs, the winding is at 85 °C. The temperature coefficient of copper is 3.9 × 10⁻³ per °C. What is the resistance of the winding now? →
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