What property defines a conductor?

The property that defines a conductor is its ability to allow electricity to pass through. Conductors, such as metals like copper and aluminum, have free electrons that can move easily within the material, facilitating the flow of electrical current. This characteristic makes them essential in electrical wiring and components, as they efficiently transmit energy without significant resistance.

In contrast, materials that resist the flow of electricity are classified as insulators. While certain materials can absorb heat or store energy, these characteristics do not specifically pertain to the definition of a conductor. Therefore, the key identifying feature of a conductor is its capability to permit electric current to flow through it.