a. Calculate the resistance from your recorded values of current and potential difference (I*R)

b. Manually enter data for diameter and resistance for the brass rods you examined.

c. Create a new calculated column showing the cross-sectional area of the rods.

d. Change the horizontal axis of your graph to cross-sectional area. What relationship appears to exist between resistance and the cross-sectional area of the rods?

e. Test your conclusion by creating another calculated column and modifying the cross-sectional area so as to produce a linear plot. If successful, write a statement describing the relationship you have found.

0.6 cm Brass Rod

length (m)	current 1	current 2
0	0.03836	0.541479
0.05	0.027418	0.541108
0.1	0.037203	0.541014
0.1	0.036204	0.51922
0.15	0.037754	0.519876
0.2	0.036076	0.519453
0.25	0.027742	0.519447

0.3 Brass Rod

Length (m)	current 1	current 2
0	0.037262	0.541005
0.05	0.035879	0.54086
0.1	0.034614	0.540582
0.15	0.035977	0.540349
0.2	0.035273	0.540225
0.25	0.03394	0.539593
0.3	0.033974	0.539599
0.35	0.032335	0.539654

0.3 Aluminum Rod

length (m)	current 1	current 2
0	0.021398	0.541494
0.05	0.021142	0.541383
0.1	0.01116	0.54141
0.15	0.011292	0.541092
0.2	0.027925	0.540965
0.25	0.028505	0.540669
0.3	0.023436	0.540591
0.35	0.032384	0.540086