(a) Using the data in Table 18.1, compute the resistance of an aluminum wire 5 mm (0.20 in.) in diameter and 5 m (200 in.) in length.
(b) What would be the current flow if the potential drop across the ends of the wire is 0.04 V?
(c) What is the current density?
(d) What is the magnitude of the electric field across the ends of the wire?
Table 18.1 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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