Which is a conductor of electricity?

**The reasoning** Conductors are materials that allow electric current (flow of electrons) to pass through them easily. Metals like **copper** have free electrons in their atomic structure that can move freely from atom to atom. When you connect copper to a battery or power source, these electrons flow smoothly, carrying electrical current. That's why copper is used in electrical wires, phone chargers, and all the cables around your house. Its atomic structure makes it perfect for conducting electricity. **Why the wrong options tempt you** **Rubber, plastic, and wood** are all **insulators** — they hold their electrons tightly and don't let current flow. You might pick them if you're guessing randomly, but notice: rubber and plastic are actually used to *cover* electrical wires specifically because they DON'T conduct! Wood might seem natural and "connective," but it blocks electricity (when dry). **Quick takeaway** **Metals conduct, non-metals insulate** — Copper and other metals have free electrons that carry current, while rubber, plastic, and wood trap their electrons and block flow. Think of the wire in your phone charger: copper inside, plastic outside!