Answer
$I = 5.97 A$
Work Step by Step
Required:
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
We are asked to find the current flow if the potential drop across the ends of the wire is 0.04 V.
Solution:
From Item 18.5a, $R= 6.70 \times 10^{-3} Ω$
Combining Equations 18.2 and 18.4 and using $σ = 3.8 \times 10^{7} (Ω−m)^{-1}$ from table 18.1, we find:
$I = \frac{V}{R} = \frac{0.04 V}{6.70 \times 10^{-3} Ω} = 5.97 A$