A copper transmission cable 100 km long and
Answered question
2022-05-14
A copper transmission cable 100 km long and 10.0 cm in diameter caries a current of 125 A. What is the potential drop across the cable?
Answer & Explanation
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Skilled2022-06-09Added 403 answers
Given
We are given the length of the copper wire and the is radius with a current
Solution
(a) Our target is to find the potential drop across the cable. The current flows in the copper wire experiences a resistance due to the material that causes a voltage drop, so we can use Ohm's law from equations 25.9 and 25.10 to find the voltage across the wire in the next form
Where p is the resistivity of the copper and equals and A is the cross-sectional area of the wire and equals . Now we can plug our values for I, r, L and into equation (1) to get the voltage
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