Conductors are materials that freely allow the flow of electrons with very little resistance.

Water, copper, and iron

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Semiconductors are materials that do not allow electrons to flow freely but do not directory stop them either.

Silicon(Used in computer chips)

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Insulators are materials that greatly impede or stop the flow of electrons with very high resistance.

Glass, dry air, and rubber

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Compare conductors and Insulators

Conductors- nickel, nail, key, aluminum

Insulators - does not conduct electricity, rubber, clothes pin

Both - pencil

Compare Semiconductors and Insulators

Semiconductors - Silicon, mist air, cotton, wool

Insulators - wood, rubber, glass, dry air