Copper is most widely used metal, because of its high conductivity and low resistivity.
Copper is a Nonmagnetic metal and high current density.
It is Reddish brown colour with high metallic luster.
It has high resistance to corrosion.
It is highly malleable and ductile.
It can easily soldered and welded at red heat.
Its melting point is 10840 C.
Electrical resistivity is 1.682 micro ohm cm.
Its tensile strength varies from 3 to 4.7 tonnes / cm2.
It forms important alloys like brass, bronze….
Its boiling point is 25950 C.
It has low contact resistance.
It oxidizes above 1800 .
It has high tensile strength & Toughness.
Applications:
Copper is mainly used for wires, cables, Winding of generators and transformers, overhead conductors, bus bars etc.
It is used for contacts material for control relays.
It is also used for motor starter switches and tap changers.
Hard drawn copper conductors is mechanically strong with high tensile strength 40 kg/mm2. It is used for making commutator segments, overhead lines and bus bars.
Annealed copper (soft copper) is mechanically weak, tensile strength of 20 kg/mm2. it is easily shaped into any form.
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