how can we double the cross section area of an electrical wire?
Answers
The cross-sectional area of a wire is directly proportional to the square of its radius (A = πr²), and hence to the diameter of the wire as well. Therefore, if we increase the diameter of the wire two times, its cross-sectional area will increase four times.
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If you cut directly and squarely across the width of a wire then you will look at the end and it looks like a circle.
The area of that end is the cross section area, which is Pi x r^2.
A larger cross section area results in lower resistance per foot when the type of wire is the same.
its usually expressed in square inches, square millimeters and sometimes circular mils which is an odd thing, its the square of the diameter in milli-inches. A circular mil is about .785 square milli inches. (Pi/4)
For stranded wire, the cross section will be the sum of the cross sections of its constituent strands. Despite the voids, An 18 ga. stranded wire will be constructed of enough strands of smaller wire to have as much or more copper cross section than a solid 18 ga. wire and the physical diameter will be larger because of the voids.