Energy form

In the context of physical sciences, several forms of energy have been defined. These include:
 * Thermal energy popularly known as heat
 * Chemical energy
 * Electrical energy
 * Radiant energy commonly known as light energy
 * Nuclear energy
 * Magnetic energy
 * Elastic energy
 * Sound Energy
 * Gravitational energy
 * Renewable energy
 * Non-renewable energy

Some basic textbooks group all these forms of energy into two broad categories: kinetic energy and potential energy. However, some forms of energy resist such easy classification, as is the case with light energy. Other familiar types of energy (such as heat in most circumstances) are a varying mix of both potential and kinetic energy.

However, the above set of the possible forms of energy is not a closed set. Whenever physical scientists discover that certain phenomenon appears to violate the law of energy conservation, new forms can be added, as is the case with dark energy.

Notes and references
Oblike energije