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Insulators: substance(s) which does not readily allow the passage of heat or sound.

Semiconductors: A semiconductor is a substance, usually a solid chemical element or compound, that can conduct electricity under some conditions but not others, making it a good medium for the control of electrical current.

Conductors:  A conductor is any piece of material that easily allows heat or electricity to pass through it.  (metals are the best)

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Answer:Explained

Explanation:

Insulators :Any  substance or device which does not allow electricity to conduct through it or show high resistance to current.

ex:Plastic,paper ,rubber etc

Semi-conductors:Any substance that allow electricity at certian conditons for ex. at elevated temperature.It's conductivity lies in between condutor and Insulator.ex:Silicon ,Germanium

Conductors:A substance Which readily conduct electricity  through it.

ex:copper,Aluminium

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