Answered: A lab technician is studying the effect…

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter27: Current And Resistance

Section: Chapter Questions

Problem 27.73AP

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A) A lab technician is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a silver wire at a temperature of 62.0°C and notes that it produces a current of 1.50 A. If she then applies the same voltage to the same wire at −88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for silver is 3.80 ✕ 10−3 (°C)−1. (Assume that the reference temperature is 20°C.) A B) A certain lightbulb has a tungsten filament with a resistance of 22.2 Ω when at 20.0°C and 145 Ω when hot. Assume the resistivity of tungsten varies linearly with temperature even over the large temperature range involved here. Find the temperature of the hot filament. °C

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