Radiant energy, energy that is transferred by electromagnetic radiation, such as light, X-rays, gamma rays, and thermal radiation, which may be characterize in terms of either discrete packets of energy, called photons, or stable electromagnetic waves. The conservation of energy law requires that the radiant energy consumed or emitted by a system be included in the total energy.
The term is most frequently used in the fields of radiometry, solar energy, heating and lighting, but is also used less periodically in other fields (such as telecommunications). In applications affect transmission of power from one region to another, "radiant energy" is frequently used to determine to the electromagnetic waves themselves, rather than their energy (a property of the waves).
- Electromagnetic (EM) radiation | x rays | gamma rays |