Here is a table of resistivities for various metals at 20oC.
| Material | Resistivity (ohm-meters) |
| Copper | 1.7 x 10-8 |
| Aluminum | 2.8 x 10-8 |
| Silver | 1.6 x 10-8 |
| Gold | 2.4 x 10-8 |
| Steel | 14-22 x 10-8 |
Using the values in the Table of Resistivities determine the resistance
of a wire with a circular cross section. The diameter of the wire
is .5cm and the length of the wire is 1m. Compare the resistance
of a copper wire, an aluminum wire and a gold wire of the same shape and
dimensions.