Which material is typically a good electrical conductor?

Copper is recognized as an excellent electrical conductor due to its atomic structure and the presence of free-moving electrons. Metals, in general, are known for their conductivity because they have a high density of free electrons that can move easily throughout the material when an electric field is applied. Copper's specific physical properties, including low resistivity, make it highly efficient for transmitting electrical currents, which is why it is widely used in electrical wiring and components.

In contrast, rubber, glass, and plastic are classified as insulators. These materials do not have free electrons that can move easily, which is essential for conductivity. Insulators are generally used to prevent the flow of electricity and protect users from electric shocks, making them unsuitable for applications requiring good electrical conduction.