Outline of energy

From Wikipedia, the free encyclopedia
Jump to: navigation, search

The following outline is provided as an overview of and topical guide to energy:

Energy – in physics, this is an indirectly observed quantity often understood as the ability of a physical system to do work on other physical systems.[1][2] Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert force (a pull or a push) against an object that is moving along a definite path of certain length.

Forms of energy[edit]

Forms of energy
Type of energy Description
Kinetic (≥0), that of the motion of a body
Potential A category comprising many forms in this list
Mechanical The sum of (usually macroscopic) kinetic and potential energies
Mechanical wave (≥0), a form of mechanical energy propagated by a material's oscillations
Chemical that contained in molecules
Electric that from electric fields
Magnetic that from magnetic fields
Radiant (≥0), that of electromagnetic radiation including light
Nuclear that of binding nucleons to form the atomic nucleus
Ionization that of binding an electron to its atom or molecule
Elastic that of deformation of a material (or its container) exhibiting a restorative force
Gravitational that from gravitational fields
Rest (≥0) that equivalent to an object's rest mass
Thermal A microscopic, disordered equivalent of mechanical energy
Heat an amount of thermal energy being transferred (in a given process) in the direction of decreasing temperature
Mechanical work an amount of energy being transferred in a given process due to displacement in the direction of an applied force



Main article: Units of energy
  • Barrel of oil equivalent (~6.1178632 × 109 J)
  • British thermal unit (~1055 J)
  • Calorie (~4.184 J)
  • Current solar income – the amount of solar energy that falls as sunlight
  • 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. (~1.602 × 10−19 J)
  • Planck energy, 1.22 × 1028 eV (1.96 × 109 J)
  • Erg – (symbol "erg") unit of energy and mechanical work in the centimetre-gram-second (CGS) system of units
  • 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).
  • Joule – (symbol J, also called newton meter, watt second, or coulomb volt)
  • 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.
  • Kilowatt-hour – (symbol: kW·h) corresponds to one kilowatt (kW) of power being used over a period of one hour.
  • Ton of oil equivalent
  • TPE – Ton Petroleum Equivalent, 45.217 GJ, see ton of oil equivalent

Related units and concepts[edit]

  • Volt
  • Ampere
  • Coulomb
  • Enthalpy
  • EU energy label
  • 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.
  • 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.
  • Heat
  • Mass-energy equivalence – where mass has an energy equivalence, and energy has a mass equivalence
  • Megawatt
  • Net energy gain
  • Power factor – of an AC electric power system is defined as the ratio of the real power to the apparent power.

Energy industry[edit]

Main article: Energy industry

Energy infrastructure[edit]

See especially Category:Electric power and Category:Fuels for a large number of conventional energy related topics.

Energy applications[edit]

History of energy[edit]

Main article: History of energy

Physics of energy[edit]

Allegorical and esoteric[edit]

  • Energy (esotericism), invoked by spiritualists for alternative modes of healing the human body as well as a spirit that permeates all of reality.
  • Orgone, Wilhelm Reich discovered this energy and tried to use it to cure various physical ailments and control the weather.
  • Bioenergetic analysis, body-oriented Reichian psychotherapy
  • Qi a concept from Oriental medicine that is sometimes translated as "energy" in the West.
  • Vitalism, often referred to as "energy"
  • Cold fusion, nuclear fusion at conditions close to room temperature.
  • Bubble fusion, also known as Sonofusion, energy from acoustic collapse of bubbles.
  • Water-fuelled car, powering a car using water as fuel.


Energy issues[edit]

Energy policies and use – national and international[edit]


Regional and national[edit]


Main article: Energy economics

Energy companies[edit]

Non-profit organizations[edit]

Industry associations[edit]

  • OPEC – Organization of Petroleum-exporting Countries
  • IEA – International Energy Agency
  • CAPP – Canadian Association of Petroleum Producers
  • World LP Gas Association – WLPGA



See also[edit]


  1. ^ "Retrieved on 2010-Dec-05". Faculty.clintoncc.suny.edu. Retrieved 2010-12-12. 
  2. ^ "Retrieved on 2010-Dec-05" (PDF). Retrieved 2010-12-12. 

External links[edit]