Drift Velocity: Building Codes Usually Limit the Current Carried by a 1.6-Mm

question 22

Multiple Choice

Drift velocity: Building codes usually limit the current carried by a 1.6-mm diameter copper wire to 15 A. Many household circuits are wired with this size wire. What is the drift velocity of the electrons in this case?. Assume one conduction electron per atom in copper. The atomic weight of copper is 63.3 g/mol and its density is 8900 kg/m³. Avogadro's number is 6.022 × 10²³ molecules/mol and e = 1.60 × 10^-19 C.

• A) 5.51 × 10^-4 m/s
• B) 4.56 × 10^-4 m/s
• C) 1.65 × 10^-3 m/s
• D) 4.44 × 10^-2 m/s
• E) 4.89 × 10^-5 m/s

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