Conductors , Semiconductors , Insulators
Are materials that freely allow the flow of electrons with very little resistance.
- Real world examples: Copper, aluminum, gold, and silver.
Are materials that do not allow electrons to flow freely but do not directly stop them either. Semiconductors have more resistance than conductors but less resistance than insulators.
- Real world examples: germanium, selenium, and silicon
Are materials that greatly impede or stop the flow of electrons with very high resistance.
- Real world example : glass, air, plastic, rubber, and wood.