For a stranded cable:
Use a micrometre or vernier gauge to measure 1 strand; this gives you the diameter of the strand.
Halve this figure for the radius, square the number and multiply by pi.
(pi r squared is the area of a circle).
Finally multiply the result by the number of strands which then gives you the true csa of the stranded cable.
If the diameter doubles (x2), the cross-sectional area quadruples (x4).
Imagine the wire is straight, now cut through at right angle to the centre line, the exposed surface is the cross sectional area, on a round wire it = pi * radius2 (area of a circle)
Other things being equal, more cross-sectional area will cause less resistance.
It quadruples.
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The resistance of a wire is inversely proportional to the cross-sectional area of the wire. This means that as the cross-sectional area of the wire increases, the resistance decreases, and vice versa.
If you slice a wire cleanly and then look at the cut end, you see a little circle at the end. The area of that circle is the "cross-sectional area" of the wire. The larger that area is, the lower the DC resistance of the wire is.
If the diameter doubles (x2), the cross-sectional area quadruples (x4).
Imagine the wire is straight, now cut through at right angle to the centre line, the exposed surface is the cross sectional area, on a round wire it = pi * radius2 (area of a circle)
Other things being equal, more cross-sectional area will cause less resistance.
Since resistance is inversely-proportional to cross sectional area, the lower the cross-sectional area, the higher the resistance. So ALL types of wire exhibit this behaviour!
No, the resistance of a wire primarily depends on its length, resistivity, and temperature. The cross-sectional area of the wire influences the wire's resistance indirectly by affecting the wire's overall resistance. A larger cross-sectional area generally results in lower resistance due to increased conducting area for current flow.
It quadruples.
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Yes, bending the wire can potentially affect its electrical resistance. The resistance of a wire is influenced by its dimensions, material, and temperature. Bending a wire can alter its cross-sectional area, length, or even cause deformations that impact the flow of electrons and increase resistance.
When the diameter of a wire is doubled, its cross-sectional area increases by a factor of four. Resistance is inversely proportional to cross-sectional area, so the resistance would decrease by a factor of four.
A thin wire will have higher resistance than a thick wire. This is because resistance is inversely proportional to the cross-sectional area of the wire - a thicker wire has a larger cross-sectional area compared to a thin wire, so it offers less resistance to the flow of current.