Materials which do not allow electric current to flow through them is known as

Materials which do not allow an electric current to flow through them are known as insulators.

Materials such as glass, rubber, wood, plastics are examples of insulators.

The electrons in the insulators are bound to each other so tightly that there are no free electrons available for the movement. And that’s how the electricity cannot be passed through them.

Difference between conductors and insulators:

Conductors Insulators
Materials which allow an electric current to pass through them are known as conductors. Materials which do not allow an electric current to pass through them are known as insulators.
The thermal conductivity of conductors is high. The thermal conductivity of insulators is low.
The conductivity of these materials is very high. The conductivity of these materials is very low.
The resistivity of these materials is low. The resistivity of these materials is high.
Metals like iron, copper etc are examples of conductors. Rubber, plastics, glass are examples of insulators.
Conductors find application in making of electrical wires and conductors. Insulators find application as supporting equipment for conductors.

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