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Energy system can refer to: 1  Electric power system, for supply, transmission and consumption of electric power. 2  Thermodynamic system, a physics concept for analysis of thermal energy exchange. 3  Bioenergetic systems, metabolic processes for converting energy in living organisms.
Energy occurs in many forms, including chemical energy, thermal energy, electromagnetic radiation, gravitational energy, electric energy, elastic energy, nuclear energy, and rest energy. These can be categorized in two main classes: potential energy and kinetic energy. Kinetic energy is the movement energy of an object. Kinetic energy can be transferred between objects and transformed into other kinds of energy.