2. (15 pts) A resistor is made of tungsten, which has a resistivity of 5.6 2 m, a temperature coefficient of resistivity of 0.0045 1/°C, and a cross-sectional area of 4.0 x 106 m². It is measured to have a resistance of 120 k2 at To = 20° C. a. What is the length of the resistor? R= P b. If hooked to a 9-V battery, what is the current in the circuit? V=IR c. Tungsten has a charge carrier density of 1.87 x 1028 charge carriers per m³. What is the drift speed in the tungsten? d. After the resistor has been attached to the battery for a while, the temperature of the resistor has reached 60° C. What is its resistance now?
2. (15 pts) A resistor is made of tungsten, which has a resistivity of 5.6 2 m, a temperature coefficient of resistivity of 0.0045 1/°C, and a cross-sectional area of 4.0 x 106 m². It is measured to have a resistance of 120 k2 at To = 20° C. a. What is the length of the resistor? R= P b. If hooked to a 9-V battery, what is the current in the circuit? V=IR c. Tungsten has a charge carrier density of 1.87 x 1028 charge carriers per m³. What is the drift speed in the tungsten? d. After the resistor has been attached to the battery for a while, the temperature of the resistor has reached 60° C. What is its resistance now?
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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