Which material typically acts as a good insulator?

Rubber is considered a good insulator because it has a high resistance to electrical flow, meaning it does not conduct electricity well. Insulators like rubber are used to prevent the unwanted flow of current, protecting both equipment and users from electric shock. This property arises from the structure of rubber, which does not allow free movement of electrons, thereby minimizing conductivity.

In contrast, materials like aluminum, silver, and copper are metals known for their high conductivity, which makes them suitable for electrical wiring and components where efficient current flow is required. However, these properties also mean they are not effective insulators.