Question

Electrical wires have a coating of insulating material. The material, generally used is

• A. Sulphur
• B. Graphite
• C. PVC
• D. All can be used

Answer 1

The correct option is C

PVC

Insulator:

1. Insulators are material which does not allow the flow of electric current.
2. Therefore, insulators are used to coat electrical wires to avoid severe accidents.
3. PVC is an abbreviated form of polyvinyl chloride.
4. The electrical characteristics of PVC such as electrical insulating properties or dielectric constant are excellent and hence, are used as insulating materials.
5. Graphite is a good conductor of electricity therefore it cannot be used for insulating electrical wires.
6. Sulfur also has insulating properties but it cannot be used for insulating electrical wires because of its brittle nature.

Therefore, option C (PVC) is the correct answer.