1. Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper. As

Question

1. Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper. Assume the wire has a resistance R = 0.400 ?, and all of the copper is used.

(a) What will be the length of the wire?
1 m

(b) What will be the diameter of the wire?
2

1. Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper. Assume the wire has a resistance R = 0.400 ?, and all of the copper is used. (a) What will be the length of the wire? 1 m (b) What will be the diameter of the wire? 2 A mu m 2. A high-voltage transmission line with a resistance of 0.32 ohm /km carries a current of 1050 A. The line is at a potential of 740 kV at the power station and carries the current to a city located 156 km from the station. (a) What is the power loss due to resistance in the line? 5.50e+7 this is the right answer (b) What fraction of the transmitted power does this loss represent? on this problem I got 7.43 but it says its wrong NEED HELP

Explanation / Answer

V= mass/density = 1 x 10^-3 / 8.92 x 10^3 = 1.12 x 10^-7
V = A.L = 1.12 x 10^-7
a) A = p/R.L= 4.25 x 10^-8 .L
   substitute this in A.L equation --> 1.62 m
b) A =pi.d^2/4 = 1.12 x 10^-7
d = 0.296 mm

2) b) Power transmitted = 740^3 V x 1050A = 4.25x 10^11 W
%loss = (5.5x10^7 / 4.25x 10^11) x 100 .. .. .. ?% = 12.9

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