Temperature Measurement Using the Resistivity of Copper

Results and Calculations-

1. Plot the copper thermometer results as a function of temperature (mercury thermometer). Show your plot to the TA before you leave the lab.

2. Extrapolate the experimental results to cover the range in temperature between 150 and -273 °C.

3. Calculate the resistivity for each data point and plot resistivity versus temperature.

a) Find an equation for the resistivity as a function of temperature through a least squares analysis.

b) Use this equation to calculate the resistance at 0 °K.

Discussion-

1. How well did a least squares analysis fit the experimental data?

2. Was any non-linear behavior observed? What might have been some potential causes?

3. Can the experimental equation be extrapolated (with confidence) to determine resistance over a wider range of temperatures? Explain.

4. Compare your plot of resistivity versus temperature to handbook values (Materials Science and Engineering an introduction, Canister. 7th Ed.. pp. 675).

5. When electric current is passed through a thin wire of length 1 and area. A the resistance is given by:

R = p l/A

where p is the resistivity of the metal. With I and A known from Table 1 for the 40 gauge copper wire and p for copper at room temperature being equal to 1.7 x 10^-8 ohm-meters, what is the predicted resistance of the copper wire? How does this compare to the measured value?

Attachment:- Assignment.rar