This is an index of energy articles.
 |
This is an index of energy articles.
|
Activation energy - Alternative energy - Alternative energy indexes - American Museum of Science and Energy (AMSE) - Anisotropy energy - Atomic energy
Binding energy - Bioenergy - Black hole - Breeder reactor - Brown energy
Characteristic energy - Chemical energy - Conservation of energy - Consol Energy
Dark energy - Decay energy - Direct Energy - Dirichlet's energy - Dyson's sphere
Ecological energetics - Electric Bond and Share Company - Electric potential energy - Electrochemical energy conversion - Embodied energy - Encircled energy - Energy - Energy accidents - Energy accounting - Energy amplifier - Energy applications of nanotechnology - Energy balance (biology) - Energy bar - Energy barrier - Energy being - Energy carrier - Energy Catalyzer - Energy cell - Energy charge - Energy conservation - Energy conversion efficiency - Energy crop - Energy current - Energy density - Energy-depth relationship in a rectangular channel - Energy development - Energy-dispersive X-ray spectroscopy - Energy distance - Energy drift - Energy drink - Energy efficiency gap - Energy-Efficient Ethernet - Energy-efficient landscaping - Energy elasticity - Energy engineering - Energy (esotericism) - Energy expenditure - Energy factor - Energy field disturbance - Energy filtered transmission electron microscopy - Energy transfer - Energy flow (ecology) - Energy flux - Energy forestry - Energy functional - Energy gel - Energy harvesting - Energy independence - Energy input labeling - Energy landscape - Energy level - Energy level splitting - Energy management software - Energy management system - Energy–maneuverability theory - Energy Manufacturing Co. Inc - Energy medicine - Energy–momentum relation - Energy monitoring and targeting - Energy Probe - Energy profile (chemistry) - Energy quality - Energy recovery ventilation - Energy security - Energy (signal processing) - Energy Slave - Energy Star - Energy statistics - Energy Storage Challenge - Energy storage - Energy system - Energy technology - Energy tower (downdraft) - Energy transfer - Energy transfer upconversion - Energy transformation - Energy value of coal - Energy vortex (stargate) - Enthalpy - Entropy - Equipartition theorem - E-statistic - Exertion
Geothermal energy - Gravitational energy - Gravitational potential
Interaction energy - Intermittent energy source - Internal energy - Invariant mass - Ionization energy
Magnetic confinement fusion - Marine energy - Mass–energy equivalence - Mechanical energy - Möbius energy - Muzzle energy
Negative energy - Nuclear fusion - Nuclear power - Nuclear reactor
Photosynthesis - Potential energy - Power (physics) - Primary energy
Seismic scale - Solar energy - Solar thermal energy - Sound energy - Specific energy - Specific kinetic energy - Specific orbital energy - Surface energy
Thermal energy - Thermodynamic free energy - Threshold energy - Tidal power - Turbulence kinetic energy
Watt meter - Work (physics) - World energy resources and consumption - World Forum on Energy Regulation
Zero-energy building - Zero-energy universe - Zero-point energy
Energy is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity—the law of conservation of energy states that energy can be converted in form, but not created or destroyed; matter and energy may also be converted to one another. The unit of measurement for energy in the International System of Units (SI) is the joule (J).
Nuclear fusion is a reaction in which two or more atomic nuclei, usually deuterium and tritium, combine to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or absorption of energy. This difference in mass arises due to the difference in nuclear binding energy between the atomic nuclei before and after the reaction. Nuclear fusion is the process that powers active or main-sequence stars and other high-magnitude stars, where large amounts of energy are released.
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors. The term potential energy was introduced by the 19th-century Scottish engineer and physicist William Rankine, although it has links to the ancient Greek philosopher Aristotle's concept of potentiality.
Spacecraft propulsion is any method used to accelerate spacecraft and artificial satellites. In-space propulsion exclusively deals with propulsion systems used in the vacuum of space and should not be confused with space launch or atmospheric entry.
A nuclear thermal rocket (NTR) is a type of thermal rocket where the heat from a nuclear reaction replaces the chemical energy of the propellants in a chemical rocket. In an NTR, a working fluid, usually liquid hydrogen, is heated to a high temperature in a nuclear reactor and then expands through a rocket nozzle to create thrust. The external nuclear heat source theoretically allows a higher effective exhaust velocity and is expected to double or triple payload capacity compared to chemical propellants that store energy internally.
A nuclear electric rocket is a type of spacecraft propulsion system where thermal energy from a nuclear reactor is converted to electrical energy, which is used to drive an ion thruster or other electrical spacecraft propulsion technology. The nuclear electric rocket terminology is slightly inconsistent, as technically the "rocket" part of the propulsion system is non-nuclear and could also be driven by solar panels. This is in contrast with a nuclear thermal rocket, which directly uses reactor heat to add energy to a working fluid, which is then expelled out of a rocket nozzle.
In a traditional nuclear photonic rocket, an onboard nuclear reactor would generate such high temperatures that the blackbody radiation from the reactor would provide significant thrust. The disadvantage is that it takes much power to generate a small amount of thrust this way, so acceleration is very low. The photon radiators would most likely be constructed using graphite or tungsten. Photonic rockets are technologically feasible, but rather impractical with current technology based on an onboard nuclear power source.
An antimatter rocket is a proposed class of rockets that use antimatter as their power source. There are several designs that attempt to accomplish this goal. The advantage to this class of rocket is that a large fraction of the rest mass of a matter/antimatter mixture may be converted to energy, allowing antimatter rockets to have a far higher energy density and specific impulse than any other proposed class of rocket.
Muon-catalyzed fusion is a process allowing nuclear fusion to take place at temperatures significantly lower than the temperatures required for thermonuclear fusion, even at room temperature or lower. It is one of the few known ways of catalyzing nuclear fusion reactions.
Energy efficiency may refer to:
Energy development is the field of activities focused on obtaining sources of energy from natural resources. These activities include the production of renewable, nuclear, and fossil fuel derived sources of energy, and for the recovery and reuse of energy that would otherwise be wasted. Energy conservation and efficiency measures reduce the demand for energy development, and can have benefits to society with improvements to environmental issues.
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work or moving or provides heat. In addition to being converted, according to the law of conservation of energy, energy is transferable to a different location or object, but it cannot be created or destroyed.
In physics, energy density is the amount of energy stored in a given system or region of space per unit volume. Often only the useful or extractable energy is measured. It is sometimes confused with stored energy per unit mass, which is called specific energy or gravimetric energy density.
Aneutronic fusion is any form of fusion power in which very little of the energy released is carried by neutrons. While the lowest-threshold nuclear fusion reactions release up to 80% of their energy in the form of neutrons, aneutronic reactions release energy in the form of charged particles, typically protons or alpha particles. Successful aneutronic fusion would greatly reduce problems associated with neutron radiation such as damaging ionizing radiation, neutron activation, reactor maintenance, and requirements for biological shielding, remote handling and safety.
The following outline is provided as an overview of and topical guide to energy:
Energy recovery includes any technique or method of minimizing the input of energy to an overall system by the exchange of energy from one sub-system of the overall system with another. The energy can be in any form in either subsystem, but most energy recovery systems exchange thermal energy in either sensible or latent form.
A pressurized heavy-water reactor (PHWR) is a nuclear reactor that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator. PHWRs frequently use natural uranium as fuel, but sometimes also use very low enriched uranium. The heavy water coolant is kept under pressure to avoid boiling, allowing it to reach higher temperature (mostly) without forming steam bubbles, exactly as for a pressurized water reactor (PWR). While heavy water is very expensive to isolate from ordinary water (often referred to as light water in contrast to heavy water), its low absorption of neutrons greatly increases the neutron economy of the reactor, avoiding the need for enriched fuel. The high cost of the heavy water is offset by the lowered cost of using natural uranium and/or alternative fuel cycles. As of the beginning of 2001, 31 PHWRs were in operation, having a total capacity of 16.5 GW(e), representing roughly 7.76% by number and 4.7% by generating capacity of all current operating reactors.
This glossary of physics is a list of definitions of terms and concepts relevant to physics, its sub-disciplines, and related fields, including mechanics, materials science, nuclear physics, particle physics, and thermodynamics. For more inclusive glossaries concerning related fields of science and technology, see Glossary of chemistry terms, Glossary of astronomy, Glossary of areas of mathematics, and Glossary of engineering.
Direct energy conversion (DEC) or simply direct conversion converts a charged particle's kinetic energy into a voltage. It is a scheme for power extraction from nuclear fusion.
