Which one of the following is an Insulator?

By Mandeep Kumar|Updated : July 25th, 2022

1. Silver

2. Copper

3. Aluminium

4. Plastic

The material which does not allow the electric current to flow freely is called Insulator. They possess higher resistivity than semiconductors or conductors. On the other hand, the conductivity in insulators is low. The most common example of insulators is non-metals.

Answer: Plastic is an insulator.

The other materials like conductors and semi-conductors conduct electric current more easily than insulators. There is no perfect insulator because they contain small numbers of mobile charges which can carry current. The phenomenon of the breakdown voltage of an insulator can make current flow through it when a sufficiently large voltage is applied to the electric field.

Properties of an Insulator

Following are the important properties of insulators:

  • They have a high air permeability since the air itself is a good insulator.

  • The outer electrons are tightly held together.

  • High resistance.

  • High mechanical strength.

  • High di-electric strength, etc.

Uses of Insulator

The insulators are used for the following purpose:

  • The coating of an insulator is often applied to electric wire and cable.

  • In the manufacturing of printed circuit boards, transistors, and ICs.

  • In a high voltage transformer, liquid insulator oil is used, etc.

Summary:

Which one of the following is an Insulator?

Plastic is an insulator. It does not conduct electricity because electrons in them cannot move freely.

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