This is a list of energy topics which identifies articles and categories that relate to energy in general. Energy refers to "the ability to do work". The word is used in several different contexts. The engineering use has a precise, well-defined meaning, whilst many non-technical uses often do not. In science and physics, it's an attribute of a physical system that is related to work, force and matter.
Potential energy, the form of energy that is due to position of an object
Kinetic energy, the form of energy as a consequence of the motion of an object or its constituents
Mechanical energy, the potential energy and kinetic energy present in the components of a mechanical system.
Binding energy, a concept explaining how the constituents of atoms or molecules are bound together
Bond energy, a measure of the strength of a chemical bond
Blue energy, energy retrieved from the difference in the salt concentration between seawater and river water
Nuclear energy, energy that is the consequence of decomposition or combination of atomic nuclei
Gibbs free energy, a related concept in chemical thermodynamics that incorporates entropy considerations too
Helmholtz free energy, a thermodynamic potential that measures the "useful" work obtainable from a closed thermodynamic system at a constant temperature, useful for studying explosive chemical reactions
Elastic energy, which causes or is released by the elastic distortion of a solid or a fluid
Ionization energy - the (IE) of an atom is the energy required to strip it of an electron.
Interaction energy, the contribution to the total energy that is a result of interaction between the objects being considered
Internal energy - (abbreviated E or U) the total kinetic energy due to the motion of molecules (translational, rotational, vibrational) and the total potential energy associated with the vibrational and electric energy of atoms within molecules.
Hubbert peak theory, also known as peak oil - the theory that world oil production will peak (or has peaked), and will then rapidly decline, with a corresponding rapid increase in prices.
Electronvolt - (symbol: eV) is the amount of energy gained by a single unbound electron when it falls through an electrostatic potential difference of one volt
Planck energy, 1.22 × 1019 GeV (billion electron volts)
Fill factor - defined as the ratio of the maximum power (Vmp x Jmp) divided by the short-circuit current (Isc) and open-circuit voltage (Voc) in light current density - voltage (J-V) characteristics of solar cells.
Foot-pound - (symbol ft·lbf or ft·lbf) is an Imperial and U.S. customary unit of mechanical work, or energy, although in scientific fields one commonly uses the equivalent metric unit of the joule (J). There are approximately 1.356 J/(ft·lbf).
Gigaton - Metric Unit of mass, equal to 1,000,000,000 (1 billion) metric tons, 1,000,000,000,000 (1 trillion) kilograms
Any of various units of energy, such as gigatons of TNT equivalent, gigatons of coal equivalent, gigatons petroleum equivalent.
Gray (unit) - (symbol: Gy), is the SI unit of energy for the absorbed dose of radiation. One gray is the absorption of one joule of radiation energy by one kilogram of matter. One gray equals 100 rad, an older unit.
Power beaming - Moving energy from one place to another through "empty space" (or air)
Power factor - of an AC electric power system is defined as the ratio of the real power to the apparent power.
Therm - (symbol thm) a non-SI unit of heat energy. It is approximately the heat equivalent of burning 100 cubic feet of natural gas. In the US gas industry it is defined as exactly 100,000 BTU59°F or 105.4804 megajoules.
