Final answer:
Metals are good electrical conductors because they have free electrons that can move freely among the atoms in a 'sea' of electrons.
Step-by-step explanation:
Metals are good electrical conductors because they have free electrons that can move freely among the atoms in a 'sea' of electrons. When an electrical field is applied, these free electrons respond by accelerating, allowing for the flow of electrical current.
Non-metals, on the other hand, do not have free electrons that can move as easily, and therefore do not conduct electricity well. Examples of non-metals are plastic, wood, cotton material, and ceramic.
In the context of noncurrent carrying conductive members, materials such as ships' superstructures, container vehicle bodies, and tube trains are typically made of metals, which make them good conductors of electricity.