It has a different weight, cost, conductivity, ductility, tensile, color, temperature resistance, and many more. Aluminum Wires are much cheaper, have less conductivity, ductile and tensile, are lighter, and are corrosive as compared to Copper Wires.
Aluminum Wires are more economical, and the lighter wire which increases its usage. Although the Aluminum Wire cannot be used at every place due to the corrosive nature.
And it is slightly difficult to make wire out of the Aluminum due to its less tensile and ductile nature. Copper Wires can be easily made out of copper as it is more ductile and tensile and also can be used at more places, even at high temperatures, but the only disadvantage it has is its price and its weight.
Using a larger size conductor has the add-on effect of requiring a greater amount of insulation material to adequately cover the conductor and the extra cross-sectional size of the cable may be restrictive in certain applications. Copper is more thermally conductive than aluminium but again, when the larger conductor sizes are factored in the differences are reduced.
The better the thermal conductivity the better the short circuit performance of the conductor. In some cases copper-clad aluminium conductors consisting of an aluminium core with a heavy skin of copper bonded to the aluminium can be used. Whilst not in widespread use, this conductor type does combine the advantages of the lighter weight aluminium with the more conductive copper.
The ductility is however that of aluminium and not the improved performance of copper. This conductor type has found some favour with coaxial cables as a lightweight centre conductor.
The lighter weight wire allows the use of lower density dielectric material for better attenuation. The electron mobility of materials determines their conductivity, that is a material with high electron mobility possess high conductivity and which have less mobility is a poor conductor. Apart from the conductivity, various parameters such as its weight, cost, structure, etc.
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