A material that allows an electric current to flow through it is an electrical conductor. A material through which an electric current cannot flow easily is called an insulator. Which statement best describes the difference between an insulator and a conductor?
An insulator has a static charge, and a conductor does not.
A conductor contains more electrons than an insulator.
A conductor is a metal, and an insulator is any material that is not a metal.
An insulator does not have electrons that are free to move, and a conductor does.
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