A transmission line cable consists of 7 strands of identical copper conductors. The physical length of the cable is 6 km. But, because of the twist on each strand, the actual lengths of the conductors are increased by 4%. If the resistance of the cable is 10.9 Q at 20°C, what is its diameter in mm? Inferred zero Temperature Coefficient @ 20°C Material Resistivity @ 20°C resistance temperature Aluminum 2.83×10-8 n-m 39.06x10-4 °C -236 °C
A transmission line cable consists of 7 strands of identical copper conductors. The physical length of the cable is 6 km. But, because of the twist on each strand, the actual lengths of the conductors are increased by 4%. If the resistance of the cable is 10.9 Q at 20°C, what is its diameter in mm? Inferred zero Temperature Coefficient @ 20°C Material Resistivity @ 20°C resistance temperature Aluminum 2.83×10-8 n-m 39.06x10-4 °C -236 °C
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Transcribed Image Text:A transmission line cable consists of 7 strands of identical copper conductors. The physical length of the cable is 6 km. But, because of the twist on each strand, the actual lengths of the
conductors are increased by 4%. If the resistance of the cable is 10.9 Q at 20°C, what is its diameter in mm?
Inferred zero
Temperature
Coefficient @ 20°C
Material
Resistivity @ 20°C
resistance
temperature
Aluminum
2.83×10-8 Q-m
39.06x10-4 °C
-236 °C
Copper
1.72×10-8 0-m
39.29x104 /°C
-234.5 °C
Silver
1.64x10-8 Q-m
38.02x10-4 /°c
-243 °C
Tungsten
5.5x10-8 0-m
45.05x104 /°C
-202 °C
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