Which material is considered a good insulator of electricity?

Rubber is considered a good insulator of electricity because it has high resistance to electrical current. This property makes rubber an effective material for preventing the flow of electricity, which is why it is commonly used to cover electrical wires and components. Insulation materials like rubber are important because they help to protect users from electric shock and prevent unintended electrical currents from passing through conductive materials.

In contrast, copper, aluminum, and gold are all excellent conductors of electricity due to their atomic structure, which allows for the free flow of electrons. They are often used in electrical wiring and components to facilitate the efficient movement of electric current. Therefore, rubber stands out as a material specifically chosen for its insulating properties rather than conductive capabilities.