Which material is a good conductor of electricity?

Copper is a primarily used material in electrical applications due to its excellent conductivity. Conductivity is a measure of how easily electric charges can move through a material. Copper possesses a high number of free electrons that facilitate the flow of electricity, making it ideal for wiring and electrical components. Its ability to conduct electricity efficiently is why it is commonly used in various electrical devices and infrastructure, such as power lines and circuit boards.

In contrast, materials like rubber, wood, and plastic are considered insulators, meaning they do not allow electric current to flow easily. These materials lack free electrons, which is why they are often used to protect and insulate electrical wiring to prevent unwanted flows of electricity.