Which of the following is an example of a conductor?

• A. Copper
• B. Rubber
• C. Wood
• D. Glass

Answer: (A)

Materials that allow electrical current to flow easily are conductors. Copper fits this role because it’s a metal with many free electrons that can move quickly when an electric field is applied, giving the path for current with low resistance. That’s why copper is the standard material used for wires and connections.

The other materials listed do not conduct well because their electrons are more tightly bound and don’t move freely. Rubber, wood (when dry), and glass act as insulators, meaning they resist current and are used to prevent unwanted electrical flow. This contrast highlights why copper is the example of a conductor.