Conductors vs. Insulaters
Thermal energy is a part of the total energy of any object.
Thermal energy is related to the temperature of an object.
The joule is the unit used to measure thermal energy.
In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.