D Label the axes AREA and RESISTANCE. Adjust the axes so the data just fits. Giv

Question

D Label the axes AREA and RESISTANCE. Adjust the axes so the data just fits. Give the graph the title "CROSS-SECTIONAL AREA VS, RESISTANCE by" followed by your name. Draw the trendline (best-fit curve) on your graph. Have Excel put the equation on the graph. PROCEDURE 4: RESISTIVITY FOR WIRES OF DIFFERENT MATERIAL Start with the aluminum wire. O Use the micrometer to measure the diameter of the aluminum wire, and record this value on your data sheet. Now, put the wire into the frame. Set the probes so the length is 24 cm, and turn on the power supply. Set the current to 1A. Read the potential difference, and record the value on your data sheet. Repeat the procedure for the copper and stainless steel wires. OCopy the values for the brass wire (from procedure 1) into the data table. For each wire: Put the data into Excel and calculate Cross-sectional area O Resistance Resistivity Be sure to record these values back on your data sheet. WHEN YOU ARE FINISHED Close all open computer files. Answer all the questions at the end of the lab. Staple the graph, data sheets and the questions together. Be sure your name is on each page. Sign the attendance sheet. O

Explanation / Answer

V = 39.4 mV = 39.4 x 10^-3 V

d = 0.447 mm; So, r = d/2 = 0.2235 mm = 0.2235 x 10^-3 m

Area A = pi x r^2

Length L = 24cm = 0.24m

Current I =1A

So, R = V/I

The formula for resistivity is:Resistivity = RA/L = (V/I)(pi x R^2)/L = (2.576 x 10^-8) ohm-m

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