Insulators oppose electrical current and make poor conductors. Some common conductors are copper, aluminum, gold, and silver. Some common insulators are glass, air, plastic, rubber, and wood. Insulators that can be polarized by an electric field are called dielectrics.

Is copper an insulator yes or no?

No, copper is not a good insulator. It is a good conductor. A conductor allows electricity or heat to pass through the material easily.

Is copper an insulator or a conductor?

In copper, there is enough heat energy at ordinary room temperatures to liberate a vast number of the weakly held valence electrons. The presence of a large number of free electrons in copper, as in other metals, is what makes it a good conductor of electricity.