Problem1. A) Findthe resistance of a 100 m long wire made of 10 gauge copper wir

Question

Problem1.

A) Findthe resistance of a 100 m long wire made of 10 gauge copper wire,which has a cross-sectional

area of5.261mm2. Assume that thetemperature of the wire is 20C. (See Table18-1).

B) A birdstands on a dc electric transmission line carrying 2800 A. The linehas a resistance/length

of2.5 × 105 /m. If the bird’sfeet are 4.0 cm apart, what is the voltage difference betweenthe

bird’s feet?

C)Why can birds sit safely on a high voltagetransmission line (see B) but leaning a metal

ladderagainst the high voltage line is very dangerous?

Explanation / Answer

C)Since the voltagedifference between the birds feet there is no current passesthrough the bird's body.So, birds sit safely on ahigh voltage transmission line (see B) but leaning ametal

ladder against the high voltageline is very dangerous?

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