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Explain the properties of high resistivity materials.
High resistivity materials: The conducting materials containing resistivity from 10-6 to 10-3 ohm-m come under such category and is used for making resistance components for heating devices, rheostats and precision instruments.
Examples are: Constantian, Nichrome and Mangnesium.
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.
High 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 different shapes and sizes.
High melting point: These materials that are used as heating elements must have high melting point.
Oxidation resistance: The material must have an oxidation resistanceso that this must get oxidized when used in various environmental conditions.
Instruction size As we have seen already that each instruction has two parts Opcode ( Operation Code) Which tells the types of operation to be performed .
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