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Explain the properties of low resistivity materials.
Low resistivity materials: The conducting materials containing resistivity from 10-8 to 10-6 ohm-m come under this class and are used in distribution and transmission lines, transformers and motor windings.
Illustrations are: Copper, Aluminium and Gold
Properties:-
Low temperature coefficient: In voltage drop and power loss for minimum variations with the change in temperature, such materials must have low temperature coefficient.
Sufficient mechanical strength: These materials should withstand the mechanical stresses developed throughout its use for specific applications.
Ductility: The material to be utilized, as conductors should be ductile so that this can be drawn and moulded in various sizes and shapes.
Solderability: The conducting materials are needed to be joined and the joint should have minimum contact resistance. These materials should have good solder capability.
Resistance to corrosion: The material should have a high resistance to corrosion so that this must not be corroded when used in various environmental conditions.
explain the properties and the application of high resistivity materials related with tunsten and carbon?
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