Why is a good conductor of electricity also a good conductor of heat?

Answer 1

We know that a conductor allows electricity to move through it. Conductors have a source called mobile electrons that go side to side inside the conductor itself when an external source connects to it their source goes through the conductor allowing electricity to flow.

Answer 2

A good conductor of electricity is also a good conductor of heat because both processes rely on the movement of free electrons. In a good conductor, free electrons are able to flow easily in response to an electric field, carrying charge and heat energy with them. Therefore, materials that facilitate the flow of electrons for electrical conduction also tend to facilitate the flow of heat energy.