A copper wire 100 m long must experience a voltage drop of less than 1.5 V when a current of 2.5 A passes through it. Using the data in Table 12.1, compute the minimum diameter of the wire.
Table 12.1 Room-Temperature Electrical Conductivities for Nine Common Metals and Alloys
Metal | Electrical Conductivity [(Ω m)–1] |
Silver | 6.8 × 107 |
Copper | 6.0 × 107 |
Gold | 4.3 × 107 |
Aluminum | 3.8 × 107 |
Brass (70 Cu–30 Zn) | 1.6 × 107 |
Iron | 1.0 × 107 |
Platinum | 0.94 × 107 |
Plain carbon steel | 0.6 × 107 |
Stainless steel | 0.2 × 107 |
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