The insulator helps to stop or decrease the flow of electric current through the electric wire. The insulator is able to stop the flow of electric current because the electrons present in the insulator are not able to move readily.
An insulator is a material in which electrons are tightly packed and not able to move freely or readily so that they are not able to flow the current in it.
Examples; plastic, rubber. wood, paper, rubber, glass, etc.
Every insulator has some amount of mobile electrons but not as same as the conductor.
Electrons are responsible for the flow of electrons in any material. The more the number of free electrons more the amount of flow of current. The conductor has the highest amount of free electrons present therefore its conductance is high.
Insulators have a minimum amount of free electrons and their electrons do not move readily hence insulators stop the flow of current.
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