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Compare copper and aluminium.

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Copper
Aluminium
Resistivity is less
Resistivity is more
More weight
Low weight
Mechanically strong
Mechanically weaker
Specific Gravity high
Specific Gravity Low
Welding & soldering is easy
Difficult to weld & solder
Affected chemically
Oxidizes when open
Does not break when bend
Breaks when bend
Tensile strength is double of that of aluminum
Tensile strength is half of that of copper
Used for winding
Used for overhead lines

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