Question

Which of the following is material that can be used for covering an electric wire to prevent shock ?
1. Rubber
2. Iron
3. Copper
4. Silver

Answer 1

Correct Answer - Option 1 : Rubber

The correct option is rubber.

• Electrical insulators are devices that do not allow an electric current to pass through them. 
• Conductors allow current to pass through them. 
• Metals are usually good conductors of electricity. For example copper, iron etc. 
• The electrical wires are covered by the insulating cover for protection against shock if someone touches them directly.  
• The rubber is an insulator, so it can be used for covering the wire. 
• The conductors like copper and silver are used to make wires and insulators like plastic, rubber are used to coat wires or make switches and plugs.