Question

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

Answer 1

Substances which conduct electricity easily are called as good conductors of electricity and those which conduct heat easily are called as good conductors of heat.

Answer 2

Metals are both good conductors of heat and electricity

Answer 3

Carriers of the information of heat and charge are electrons. Metals have plenty of free electrons. That's why they are good conductors of both heat and electricity.