A transmission line is made of aluminum wire 1 inch in diameter. What is the resistance of 20 miles of this wire?
Resistance varies directly with the length of a wire and inversely with its cross-sectional area.
Resistivity of aluminum = 2.8 x 10-8
Where l=32,186.88 meters
Find cross-sectional area.
R= 2.8 x 10-8 (31,186.88)/A =
The Attempt at a Solution
I'm stuck trying to find the cross-sectional area, A.
Also, the answer has to be in the same units as the problem, so does that mean I have to convert to inches and miles? The answer should be in ohms correct?