Electrical wires have a coating of an insulating material. The material, generally used is
Sulphur
Graphite
PVC
All can be used

Correct Answer: (c) PVC

Explanation: Insulators are material that does not allow the flow of electric current.

PVC is an abbreviated form of polyvinyl chloride. The electrical characteristics of PVC such as electrical insulating properties or dielectric constant are excellent and hence, are used as insulating materials.