Which best describes the materials that make up an electrical cord?

1. a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons

2. a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons

3. a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons

4. a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons

A conductor is defined as a substance through which an electric current is able to flow freely without causing any resistance due to the availability of free electrons. Example: silver, copper, gold etc are all good conductors of electricity.

Whereas an insulator is a substance which causes high resistance to the flow of free electrons. Example: plastics, styrofoam, rubber etc are all insulators.

Thus, a electric cord which needs to conduct electric current is made up of metallic conductor with free electrons and is surrounded by an insulator to avoid electric shocks.

Answer: a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons

Explanation:

A conductor is defined as a substance through which an electric current is able to flow freely without causing any resistance due to the availability of free electrons. Example: silver, copper, gold etc are all good conductors of electricity.

Whereas an insulator is a substance which causes high resistance to the flow of free electrons. Example: plastics, styrofoam, rubber etc are all insulators.

Thus, a electric cord which needs to conduct electric current is made up of metallic conductor with free electrons and is surrounded by an insulator to avoid electric shocks.