3. A 10 km copper bundle of 10 mm diameter copper wires must experience a voltage drop of less than 1.5V when a current of 3A passes through it. a. Using information at the end of this assignment and assuming there is no interference between wires, determine the minimum number of copper wires needed for this bundle.
3. A 10 km copper bundle of 10 mm diameter copper wires must experience a voltage drop of less than 1.5V when a current of 3A passes through it. a. Using information at the end of this assignment and assuming there is no interference between wires, determine the minimum number of copper wires needed for this bundle.
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B and c pls
Transcribed Image Text:3. A 10 km copper bundle of 10 mm diameter copper wires must experience a voltage drop
of less than 1.5V when a current of 3A passes through it.
a. Using information at the end of this assignment and assuming there is no
interference between wires, determine the minimum number of copper wires
needed for this bundle.
b. As this bundle is being strung up, it gets plastically deformed. Qualitatively, what
happens to the voltage drop across this bundle, and why? Make sure you tie this
into atomic structure information you learned in this class.
c. Assuming the information at the end of the assignment is at room temperature,
qualitatively what happens to this voltage drop during the peak of winter? During
the peak of summer? What on the atomic scale is the cause for this change?
Transcribed Image Text:Table 17.1 Thermal Properties for a Variety of Materials
Cp
(J/kg-K)
Material
Aluminum
Copper
Gold
Iron
Nickel
Silver
Tungsten
1025 Steel
316 Stainless steel
Brass (70Cu-30Zn)
Kovar (54Fe-29Ni-17Co)
Invar (64Fe-36Ni)
Super Invar (63Fe-32Ni-5Co)
Alumina (Al₂O3)
Magnesia (MgO)
Spinel (MgAl₂O4)
Fused silica (SiO₂)
Soda-lime glass
Borosilicate (Pyrex) glass
Polyethylene (high density)
Polypropylene
Polystyrene
Polytetrafluoroethylene (Teflon)
Phenol-formaldehyde, phenolic
Nylon 6,6
Polyisoprene
900
386
128
448
443
235
138
486
502
375
460
500
500
775
940
790
740
840
850
1850
1925
1170
1050
1590-1760
1670
α₁
[(°C)-¹ x 10-61
Metals
23.6
17.0
14.2
11.8
13.3
19.7
4.5
12.0
16.0
20.0
5.1
1.6
0.72
Ceramics
7.6
13.5d
7.6⁰
0.4
9.0
3.3
Polymers
106-198
145-180
90-150
126-216
122
144
220
k
(W/m - K)
247
398
315
80
90
428
178
51.9
15.9
120
17
10
10
39
37.7
15.0
1.4
1.7
1.4
0.46-0.50
0.12
0.13
0.25
0.15
0.24
0.14
L
[22. WI(K)² x 10-81
2.20
2.25
2.50
2.71
2.08
2.13
3.20
2.80
2.75
2.68
IIIIII
IIIIIII
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