Energy: other forms
We could list a huge number of types of energy, but most will be different forms of the same thing.
This energy is transferred from hot regions, to cool regions because of the temperature difference between them.
N.B. Temperature is not a measure of heat. Instead it just gives an indication of the direction of heat flow.
This is really just the kinetic energy of moving charges in an electrical circuit.
Energy is carried by electromagnetic radiation, such as light or gamma rays.