Conductors+and+Insulators

n A **conductor** is a material which contains movable electric charges. A metallic (metal) substance can conduct electricity because it has electrons that are free to move (sea of electrons). The diagram below is a picture of the sea of electrons.

n An **insulator** is a material which does not contain movable electric charges. Therefore, if you place an insulator in an electrical circuit the moving electrons cannot pass.

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