Question

Calculate the diameter of the silver wire, given that the voltage across the wire is 3.1V. Using the data in Table 30.2; I. compute the resistant of the copper wire 3mm in diameter and 2m long. [ANS: 4.81 X 10-3 Ω] II. What would be the current flow if the potential drop across the ends of the wire is 0.05V? [ANS: 10.4 A] III. What is the current density? [ANS: 1.5 X 106 A/M2]

Answer #1

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Wires aren't really ideal. The voltage drop across a
current-carrying wire can be significant unless the resistance of
the wire is quite low. Suppose a 100 ft extension cord is being
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