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.