Conductors, Semiconductors, and Insulators
Conductor- material that freely allow the flow of electrons with very little resistance and also through which electric current can pass.
Ex.- Water, Copper, Iron
Insulator- a material that greatly impede or does not easily allow the flow of electrons with very high resistance including heat, light, electricity, or sound to pass through it.
Ex.- Glass, Dry air, Rubber, Copper, Aluminum, Silver.