Problem 17. 21. The resistance of a copper wire is 4 at room temperature (68°F). What is its resistance at a freezing temperature of 32°F? 23. a. The resistance of a copper wire is 1 at 4°C. At what temperature (°C) will it be 1.1 ? b. At what temperature will it be 0.1 ?
Problem 17. 21. The resistance of a copper wire is 4 at room temperature (68°F). What is its resistance at a freezing temperature of 32°F? 23. a. The resistance of a copper wire is 1 at 4°C. At what temperature (°C) will it be 1.1 ? b. At what temperature will it be 0.1 ?
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Home work
17. a. For the system in Fig. 46, the resistance of each line cannot exceed 6 m2, and the maximum
current drawn by the load is 110 A. What minimum size gage wire should be used? b. Repeat (a) for a
maximum resistance of 3 mQ, d= 30 ft, and a maximum current of 110 A.
d = 30 ft
Load
Solid round copper wire
FIG. 46
Problem 17.
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21. The resistance of a copper wire is 4 at room temperature (68°F). What is its resistance at a freezing
temperature of 32°F?
23. a. The resistance of a copper wire is 1 at 4°C. At what temperature (°C) will it be 1.1 ? b. At what
temperature will it be 0.1 ?
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