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APPARATUS

The spools contain 4 equal lengths of copper wire of different diameters.  A 2-V potential difference is applied across each and the current measured. The resistance is compared to the expected values calculated from the resistivity and dimensions of the wire.

NOTES

L = 200 ft = 61 m

ρ_Cu =1.7x10 ^-8 Ω·m

d(mm)	A(mm2)	R= L/A(Ω)
0.24	0.045	23
0.39	0.12	8.6
0.51	0.20	5.2
0.81	0.52	2.0