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Suppose you have two wires of equal length made from the same material how is it possible for the wires to have different resistances?
Wiki User
∙ 12y ago
The wires have different diameters. From the formula R = P*L/A. "A" is the the cross sectional area of the wire. Since the wires are of equal length and same material ("L" and "P") the only way they can have different resitances ("R") is if the diameters are different("A").
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoThe resistance of a material depends upon the following: the length , the cross sectional area, type of material and temperature. In electrical science the following obtains.
Two copper wires of different lengths and different "csa" will not have the same resistance.
The resistance of the wire is directly proportional to the length and inversely proportional to the "csa". The temperature of the conductors must be the same and the copper material of which they are made must be the same,
Manufacturers of copper cables produce tables of millivolt drop per metre based upon the temperature coefficient of resistance being a specified temperature. In the UK it's about 20 degrees Celsius.
As the temperature of copper increases so does its resistance.
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Suppose you have two wires of equal length made from the same material how is it possible for the wires to have differents resistances?
You don't specify diameter. I am assuming it is the same. However, the larger the wire the lower the resistance. Temperature affects resistance. The hotter the wire, the higher the resistance. You also don't specify the layout of the wire. For example you could make a coil or choke with one wire.
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