Classify the conducting materials.
Conducting materials are classified by low resistivity materials and high resistivity materials.
Low resistivity materials: The conducting materials having resistivity in between 10-8 to 10-6 ohm-m come in this category and are utilized in transmission and distribution lines, transformers and motor windings.
High resistivity materials: The conducting materials having resistivity in between 10-6 to 10-3 ohm-m come in this category and are utilized for making resistance elements for precision instruments, heating devices and rheostats.