* Mixture: A combination of two or more substances where each substance retains its own chemical properties. The substances in a mixture can be separated by physical means.

* Compound: A substance formed when two or more different elements are chemically bonded together in a fixed ratio.

Electric wires are typically made of:

* Copper or aluminum (conductor): These metals are excellent conductors of electricity.

* Insulation (plastic or rubber): This material prevents the electricity from flowing to unintended areas and protects users from electric shock.

The copper or aluminum and the insulation are separate substances that are physically combined. They can be separated by physical means like melting or peeling away the insulation. The materials don't chemically react to form a new substance.

Therefore, electric wires are considered a mixture.