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#energy (275), the (104), and (64), power (41), edit (32), history (29), from (22), that (19), unit (18), one (17), system (16), units (15), solar (14), potential (14), list (14), for (14), wind (12), electricity (12), electric (12), work (11), mechanical (11), use (10), industry (10), wikipedia (9), with (9), united (9), thermal (9), oil (9), nuclear (9), heat (9), mass (9), also (9), other (9), renewable (8), wave (8), gravitational (8), petroleum (8), kinetic (8), chemical (8), thermodynamic (8), resources (8), physics (8), water (8), form (8), 000 (8), equivalent (8), toggle (7), policy (7), natural (7), development (7), fuel (7), free (7), related (7), forms (7), outline (6), page (6), states (6), supply (6), tidal (6), gas (6), radiation (6), thermodynamics (6), temperature (6), engine (6), motion (6), equal (6), search (5), this (5), links (5), retrieved (5), physical (5), general (5), world (5), storage (5), radiant (5), binding (5), force (5), 2010 (5), body (5), see (5), 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ted with a gravitational field nuclear potential energy radiant energy 0 energy of electromagnetic radiation including light and of gravitational radiation renewable energy energy from renewable natural resources that are replenished on a human timescale rest energy 0 given by e mc 2 where m is an object s rest mass solar energy surface energy sustainable energy thermal energy 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 work physics an amount of energy being energy transferred in a given process due to displacement in the direction of an applied force electric power electricity measurement edit units edit main article units of energy list of common units for energy official or common symbol in brackets after name and exact or approximate value of unit in joule in brackets after description si unit edit joule j the si unit for energy also called newton meter watt second or coulomb volt other metric units edit kilowatt hour kw h corresponds to one kilowatt of power being used over a period of one hour 3 6 mj calorie cal equal to the energy need to raise the temperature of one gram of water by one degree celsius 4 184 j erg erg unit of energy and mechanical work in the centimetre gram second cgs system of units 10 7 j imperial or us customary units edit british thermal unit btu equal to the energy need to raise the temperature of one pound of water by one degree fahrenheit 1055 j therm thm unit of heat energy in the us gas industry it is defined as exactly 100 000 btu 59 f it is approximately the heat equivalent of burning 100 cubic feet 2 8 m 3 of natural gas 105 5 mj quad unit of energy equal to 10 15 a short scale quadrillion btu foot pound ft lbf or ft lbf unit of mechanical work or energy although in scientific fields one commonly uses joule 1 356 j other units edit electronvolt ev the amount of energy gained by a single unbound electron when it falls through an electrostatic potential difference of one volt 1 60 10 19 j planck energy e p natural unit of energy common in particle physics 1 96 10 9 j barrel of oil equivalent boe energy unit equal to the energy released when burning one barrel 159 litres of oil 6 12 gj tonne of oil equivalent toe energy unit equal to the energy released when burning one tonne of oil 42 gj related units and concepts edit volt ampere coulomb efficient energy use energy recovery energy recycling 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 waste to energy waste to energy plant watt voltage zero energy building energy industry edit energy industry worldwide energy supply outline by country region world energy resources and consumption list of energy resources substances like fuels petroleum products and electricity energy crisis the need to conserve energy resources energy development development of energy resources ongoing effort to provide abundant and accessible energy through knowledge skills and construction embodied energy the sum total of energy expended to deliver a good or service as it travels through the economy energy conservation tips for conserving energy resources energy economics as the foundation of other relationships energy policy government policies and plans for energy supply energy storage methods commonly used to store energy resources for later use energy system an interpretation the energy sector in system terms ecological energetics energy balance energy speculation free energy suppression conspiracy theory future energy development provides a general overview of future energy development history of perpetual motion machines 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 primary production power harvesting renewable energy development energy infrastructure edit see especially category electric power and category fuels for a large number of conventional energy related topics energy storage electricity generation electricity retailing grid energy storage liquified natural gas microwave power transmission power station power supply power transmission underground power station power outage uninterruptible power supply energy applications edit biofuel distributed generation electric vehicle hybrid vehicle hydrogen vehicle maglev passive solar building design steam engine vactrain history of energy edit history of energy history of the energy industry history of coal history of coal mining electricity history history of electromagnetic theory history of electrical engineering history of electronic engineering history of the electric generator history of the electric motor timeline of the electric motor history of electric power transmission history of nuclear power history of petroleum history of the petroleum industry history of renewable energy history of alternative energy history of hydropower history of solar cells growth of photovoltaics history of sustainability history of wind power timeline of sustainable energy research 2020 present history of the steam engine steam power during the industrial revolution physics of energy edit energy activation energy explains the differences in the speeds of various chemical reactions bioenergetics chemical energetics energy in physical cosmology energy in earth science that is responsible for the macroscopic transformations on the planet earth electricity exergy green energy orders of magnitude energy list describing various energy levels between 10 31 joules and 10 70 joules thermodynamics perpetual motion heat history of energy forms of energy the forms in which energy can be defined energy transformation relating to energy s changes from one form to another energy signal processing the inner product of a signal in the time domain energy density spectrum relating to the distribution of signal energy over frequencies 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 nuclear energy energy that is the consequence of decomposition or combination of atomic nuclei osmotic power also salinity gradient power or blue energy the energy available from the difference in the salt concentration between seawater and river water gibbs free energy a related concept in chemical thermodynamics that incorporates entropy considerations 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 ie the energy required to strip an atom 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 negative energy energy conversion process of converting energy from one form to another dark energy used to explain some cosmological phenomena energy quality empirical experience of the characteristics of different energy forms as they flow and transform energy density amount of energy stored in a given system or region of space per unit volume or per unit mass energy flow flow of energy in an ecosystem through food chains energetics disambiguation the scientific study of energy in general stress energy tensor the density and flux of energy and momentum in space time the source of the gravitational field in general relativity food energy energy in food that is available primary energy energy contained in raw fuels and any other forms of energy received by a system as input to the system radiant energy energy that is transported by waves rotational energy part of an object s total kinetic energy due to its rotation solar radiation radiant energy emitted by the sun particularly electromagnetic energy tidal power also called tidal energy is a form of hydropower that converts the energy of tides into useful forms of power mainly electricity dynamic tidal power tidal lagoons tidal barrages wave power is the transport of energy by ocean surface waves and the capture of that energy to do useful work for example electricity generation water desalination or the pumping of water into reservoirs machinery able to exploit wave power is generally known as a wave energy converter wec wind energy is the kinetic energy of air in motion wind power is the conversion of wind energy into a useful form of energy such as using wind turbines to make electricity windmills for mechanical power windpumps for water pumping or drainage or sails to propel ships allegorical and esoteric edit energeticism theory that there is no matter and everything is composed of energy 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 politics edit energy issues edit 2000 watt society energy democracy environmental concerns with electricity generation fuel poverty greasestock american showcase of vehicles and technologies powered by alternative energy low carbon economy peak oil soft energy path an energy use and development strategy delineated and promoted by some energy experts and activists strategic petroleum reserve disambiguation energy policies and use national and international edit international edit energy policy an introductory article energy and environmental security initiative regional and national edit main page energy policy by country energy law overview of many energy laws from various countries and states new york energy law energy tax act united states energy related legislation see also category united states federal energy legislation united kingdom energy policy of the united kingdom energy use and conservation in the united kingdom economics edit energy economics energy companies edit exxonmobil enercon company based in germany that operates in the wind turbine industry one of the biggest producers in the world saudi aramco sasol united states enrichment corporation contracts with the united states department of energy to produce enriched uranium non profit organizations edit musicians united for safe energy industry associations edit opec organization of petroleum exporting countries iea international energy agency capp canadian association of petroleum producers world lp gas association wlpga innovators edit alessandro volta charles kettering farrington daniels solar energy georges leclanché battery john frederic daniell daniell cell rudolf diesel compression ignition internal combustion engine georges imbert wood gas leonardo da vinci moritz von jacobi nicolaus otto internal combustion engine robert stirling stirling engine external combustion nikola tesla james watt steam engine with separate condensor lists edit list of books about energy issues list of energy abbreviations list of energy storage projects list of large wind farms list of notable renewable energy organizations list of photovoltaics companies list of renewable energy topics by country list of solar thermal power stations index of wave articles list of wind turbine manufacturers see also edit energy portal renewable energy portal energy disambiguation list of environment topics references edit retrieved on 2010 dec 05 faculty clintoncc suny edu archived from the original on 2007 12 13 retrieved 2010 12 12 retrieved on 2010 dec 05 pdf archived pdf from the original on 2011 04 26 retrieved 2010 12 12 jain mahesh c 2009 fundamental forces and laws a brief review textbook of engineering physics part 1 phi learning pvt ltd p 10 isbn 9788120338623 mccall robert p 2010 energy work and metabolism physics of the human body jhu press p 74 isbn 978 0 8018 9455 8 external links edit energy at wikipedia s sister projects definitions from wiktionary media from commons quotations from wikiquote texts from wikisource textbooks from wikibooks resources from wikiversity v t e energy history index outline fundamental concepts conservation of energy energetics energy units energy condition energy level energy system energy transformation energy transition mass negative mass mass energy equivalence power thermodynamics enthalpy entropic force entropy exergy free entropy heat capacity heat transfer irreversible process isolated system laws of thermodynamics negentropy quantum thermodynamics thermal equilibrium thermal reservoir thermodynamic equilibrium thermodynamic free energy thermodynamic potential thermodynamic state thermodynamic system thermodynamic temperature volume thermodynamics work types binding nuclear chemical dark elastic electric potential energy electrical gravitational binding interatomic potential internal ionization kinetic magnetic mechanical negative phantom potential quantum chromodynamics binding energy quantum fluctuation quantum potential quintessence radiant rest sound surface thermal vacuum zero point energy carriers battery capacitor electricity enthalpy fuel fossil oil heat latent h...