Lab E4

# Lab E4 - McGee 1 Lab E4 Wheatstone Bridge-Temperature...

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McGee 1 Lab E4 Wheatstone Bridge-Temperature Dependence of Resistance Allison McGee Mr. Fedorchak Thursday 2:00- 4:50pm Partner: Stevie Whitehead

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McGee 2 Abstract : The purpose of this lab was to determine the temperature coefficient of resistivity for copper. We observed a ( α ) of 1.17 x 10 -3 / o C, compared to the accepted value of 3.9 x 10 -3 / o C. This yielded a percent discrepancy of 29%. Introduction : Resistivity is a function of temperature. Usually when the temperature increases of a material, so does its resistivity, shown by the equation: ρ = ρ 20 (1+ α∆ T) The resistance can be measured by the equation: R= ρ l/A By multiplying the two equations, we get the equation: R=R 20 (1+ α∆ T) By plotting the change in temperature vs/ the resistance, will give us the temperature coefficient. To solve for R experimentally, we used the equation: R x = R s (L 1 /L 2 ) and solved Rx by reading the lengths on the potentiometer. Equipment
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## This note was uploaded on 05/05/2008 for the course PHYS 222 taught by Professor Fedorchak during the Fall '08 term at Campbell.

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Lab E4 - McGee 1 Lab E4 Wheatstone Bridge-Temperature...

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