Discuss classification of conducting materials into low resistivity and high resistivity materials.

Conducting materials are categorized as low resistivity materials and high resistivity materials.

1. 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

2. 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.