Building codes usually limit the current carried by a No. 14 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?
The diameter of this wire is 1.6 mm. 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
Answer: A
You might also like to view...
As the frequency of light increases, its energy ________.
A. moves more slowly B. decreases C. moves more quickly D. increases E. remains constant
Ypsilanti, Michigan, is located at latitude 42 degrees North. What is the altitude (above the southern horizon) of the Sun at solar noon on the summer solstice?
A. 132 degrees B. 108.5 degrees C. 71.5 degrees D. 42 degrees E. 23.5 degrees
A chemical change results in
A) new atoms. B) a physical change. C) new materials. D) a new phase.
What are Newton's three laws of motion?
What will be an ideal response?