The burning of coal, wood or oil are other examples of the release of chemical energy. Nuclear energy is analogous to chemical energy, except that the energy comes from some change in the bonding of the protons and neutrons in the nucleus. The nuclear process analogous to combining hydrogen and oxygen to form water is called fusion . This process occurs in the sun giving rise to solar energy and also occurs in the so-called hydrogen bomb explosions. The process utilized in nuclear power plants is one called fission and involves breaking a very heavy nucleus into lighter nuclei to release considerable energy.
Electrical energy is due to the electrical force.
The electrical force is the force that causes two unlike charges to attract each other and two like charges to repel each other. Electrical current, which is at least partially the movement of charged particles, includes the kinetic energy of electrons moving along in electrical wires. Radiation energy is carried by electromagnetic waves.