Instruct: Given a question, retrieve documents that answer the question.
Query: What are the main forms of energy?
The total energy of a system can be subdivided and classified into potential energy, kinetic energy, or combinations of the two in various ways. Kinetic energy is determined by the movement of an object – or the composite motion of the components of an object – and potential energy reflects the potential of an object to have motion, and generally is a function of the position of an object within a field or may stored in the field itself.
Electricity consumption was 68.90 TWh in 2014. Main sources of electricity in Chile are hydroelectricity, gas, oil and coal. Renewable energy in the forms of wind and solar energy are also coming into use, encouraged by collaboration since 2009 with the United States Department of Energy. The electricity industry is privatized with ENDESA as the largest company in the field.
The energy from moving masses of water — a popular form of hydroelectric power generation. Tidal power generation comprises three main forms, namely: tidal stream power, tidal barrage power, and dynamic tidal power.
The main energy source in Cambodia is wood, accounting for 80% of national energy consumption (UNEP, 2010). Most households, even in urban areas, rely on traditional energy sources since fossil fuels are either not available or too expensive. 94% of the population living in rural areas relies on wood, charcoal, car batteries and kerosene (UNCDF, 2010). Most primitive fuels are sourced from forests; in rural areas in the form of fuel wood and in towns and cities as charcoal. The UNDP forecasts that wood-derived fuels will remain the main source of cooking energy in rural areas until 2030.
An energy balance can be used to track energy through a system, and is a very useful tool for determining resource use and environmental impacts, using the First and Second laws of thermodynamics, to determine how much energy is needed at each point in a system, and in what form that energy is a cost in various environmental issues. The energy accounting system keeps track of energy in, energy out, and non-useful energy versus work done, and transformations within the system.
ISO 13600 series (ISO 13600, ISO 13601 and ISO 13602) are intended to be used as tools to define, describe, analyse and compare technical energy systems (TES) at micro and macro levels:In the field of energetics, an energy carrier corresponds only to an energy form (not an energy system) of energy input required by the various sectors of society to perform their functions. Energy carriers (EC) are produced by the energy sector using primary energy sources (PES). The distinction between "Energy Carriers" and "Primary Energy Sources" is extremely important since these two labels refer to energy forms of different quality so that they cannot be aggregated: 1 megajoule (MJ) of EC is not the same as 1 MJ of PES. Sunlight is a main form of primary energy, which can be transformed into plants and then into coal, oil and gas. Solar power and wind power are other derivatives of sunlight. Note that although coal, oil and natural gas are derived from sunlight, they are considered primary energy sources which are extracted from the earth (fossil fuels). Natural uranium is also a primary energy source extracted from the earth but does not come from the decomposition of organisms (mineral fuel).
In 2001, the company formed a holding company named MGE Energy, Inc. − and Madison Gas and Electric Co. became its main subsidiary.
Various energy transformations are possible. An energy balance can be used to track energy through a system. This becomes a useful tool for determining resource use and environmental impacts. How much energy is needed at each point in a system is measured, as well as the form of that energy. An accounting system keeps track of energy in, energy out, and non-useful energy versus work done, and transformations within a system. Sometimes, non-useful work is what is often responsible for environmental problems.
A problem the energy analysis method cannot resolve is that different energy forms (heat, electricity, chemical energy etc.) have different quality and value even in natural sciences, as a consequence of the two main laws of thermodynamics. A thermodynamic measure of the quality of energy is exergy. According to the first law of thermodynamics, all energy inputs should be accounted with equal weight, whereas by the second law diverse energy forms should be accounted by different values.
The situation becomes more complex when the form of energy does not remain constant. In this context Ohta formulated the question of energy quality in terms of the conversion of energy of one form into another, that is the transformation of energy. Here, energy quality is defined by the relative ease with which the energy transforms, from form to form.
If energy A is relatively easier to convert to energy B but energy B is relatively harder to convert to energy A, then the quality of energy A is defined as being higher than that of B. The ranking of energy quality is also defined in a similar way. (T.Ohta 1994, p. 90).
Nomenclature: Prior to Ohta's definition above, A.W.Culp produced an energy conversion table describing the different conversions from one energy to another. Culp's treatment made use of a subscript to indicate which energy form is being talked about. Therefore, instead of writing "energy A", like Ohta above, Culp referred to "J", to specify electrical form of energy, where" J" refers to "energy", and the ""e""subscript refers to electrical form of energy. Culps notation anticipated Scienceman's (1997) later maxim that all energy should be specified as form energy with the appropriate subscript.
Russia and the European Union have also failed to finalize the negotiations on the Energy Charter Protocol on Transit. The main issue remain open is how, and to what extent, the Protocol will include mechanisms for establishment long term transit arrangements. Also the third party access to its pipeline infrastructure has remained Russia's main objection to the Protocol.
So the total power flowing into the railgun is then simply the product formula_31. This power represents an energy flow into three main forms: kinetic energy in the projectile and armature, energy stored in the magnetic field, formula_1 and energy lost via electrical resistance heating of the rails (and armature).
Battery electric vehicles (BEVs), also known as all-electric vehicles (AEVs), are electric vehicles whose main energy storage is in the chemical energy of batteries. BEVs are the most common form of what is defined by the California Air Resources Board (CARB) as zero emission vehicle (ZEV) because they produce no tailpipe emissions at the point of operation. The electrical energy carried on board a BEV to power the motors is obtained from a variety of battery chemistries arranged into battery packs. For additional range genset trailers or pusher trailers are sometimes used, forming a type of hybrid vehicle. Batteries used in electric vehicles include "flooded" lead-acid, absorbed glass mat, NiCd, nickel metal hydride, Li-ion, Li-poly and zinc-air batteries.
Reducing energy demand is contrary to what both energy suppliers and governments have been doing during most of the modern industrial history. Whereas real prices of various energy forms have been decreasing during most of the industrial era, due to economies of scale and technology, the expectation for the future is the opposite. Previously, it was not unreasonable to promote energy use as more copious and cheaper energy sources could be anticipated in the future or the supplier had installed excess capacity that would be made more profitable by increased consumption.
Generalizing this definition to general relativity, however, is problematic; in fact, it turns out to be impossible to find a general definition for a system's total mass (or energy). The main reason for this is that "gravitational field energy" is not a part of the energy–momentum tensor; instead, what might be identified as the contribution of the gravitational field to a total energy is part of the Einstein tensor on the other side of Einstein's equation (and, as such, a consequence of these equations' non-linearity). While in certain situations it is possible to rewrite the equations so that part of the "gravitational energy" now stands alongside the other source terms in the form of the stress–energy–momentum pseudotensor, this separation is not true for all observers, and there is no general definition for obtaining it.
Energy occurs in many forms, including chemical energy, thermal energy, electromagnetic radiation, gravitational energy, electric energy, elastic energy, nuclear energy, and rest energy. These can be categorized in two main classes: potential energy and kinetic energy. Kinetic energy is the movement energy of an object. Kinetic energy can be transferred between objects and transformed into other kinds of energy.
The electron energies from beta decay are not discrete but form a continuous spectrum with a cutoff at maximum energy. The rest of the energy of each decay is carried off by an antineutrino which does not significantly interact and therefore does not contribute to the dose. Most energies of beta emissions are at about a third of the maximum energy. Beta emissions have much lower energies than what is achievable from particle accelerators, no more than few megaelectronvolts.
There are strict limits to how efficiently heat can be converted into work in a cyclic process, e.g. in a heat engine, as described by Carnot's theorem and the second law of thermodynamics. However, some energy transformations can be quite efficient. The direction of transformations in energy (what kind of energy is transformed to what other kind) is often determined by entropy (equal energy spread among all available degrees of freedom) considerations. In practice all energy transformations are permitted on a small scale, but certain larger transformations are not permitted because it is statistically unlikely that energy or matter will randomly move into more concentrated forms or smaller spaces.
Fusion powers stars and produces virtually all elements in a process called nucleosynthesis. The Sun is a main-sequence star, and, as such, generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen and makes 606 million metric tons of helium each second. The fusion of lighter elements in stars releases energy and the mass that always accompanies it. For example, in the fusion of two hydrogen nuclei to form helium, 0.7% of the mass is carried away in the form of kinetic energy of an alpha particle or other forms of energy, such as electromagnetic radiation.
All main-sequence stars have a core region where energy is generated by nuclear fusion. The temperature and density of this core are at the levels necessary to sustain the energy production that will support the remainder of the star. A reduction of energy production would cause the overlaying mass to compress the core, resulting in an increase in the fusion rate because of higher temperature and pressure. Likewise an increase in energy production would cause the star to expand, lowering the pressure at the core. Thus the star forms a self-regulating system in hydrostatic equilibrium that is stable over the course of its main sequence lifetime.
Like Ohta, H.T.Odum also sought to order energy form conversions according to their quality, however his hierarchical scale for ranking was based on extending ecological system food chain concepts to thermodyanmics rather than simply relative ease of transformation . For H.T.Odum energy quality rank is based on the amount of energy of one form required to generate a unit of another energy form. The ratio of one energy form input to a different energy form output was what H.T.Odum and colleagues called transformity: "the EMERGY per unit energy in units of emjoules per joule" (H.T.Odum 1988, p. 1135).
At a stellar core temperature of 18 million Kelvin, the PP process and CNO cycle are equally efficient, and each type generates half of the star's net luminosity. As this is the core temperature of a star with about 1.5 , the upper main sequence consists of stars above this mass. Thus, roughly speaking, stars of spectral class F or cooler belong to the lower main sequence, while A-type stars or hotter are upper main-sequence stars. The transition in primary energy production from one form to the other spans a range difference of less than a single solar mass. In the Sun, a one solar-mass star, only 1.5% of the energy is generated by the CNO cycle. By contrast, stars with 1.8 or above generate almost their entire energy output through the CNO cycle.
The first (1) and the second (2) phase are always divided by some form of interface, what results in an interfacial energy formula_4. One can now ask whether this energy can be lowered by inserting a third phase (l) in between (1) and (2). Written in interfacial energies this would mean:
An accumulator is an energy storage device: a device which accepts energy, stores energy, and releases energy as needed. Some accumulators accept energy at a low rate (low power) over a long time interval and deliver the energy at a high rate (high power) over a short time interval. Some accumulators accept energy at a high rate over a short time interval and deliver the energy at a low rate over longer time interval. Some accumulators typically accept and release energy at comparable rates. Various devices can store thermal energy, mechanical energy, and electrical energy. Energy is usually accepted and delivered in the same form. Some devices store a different form of energy than what they receive and deliver performing energy conversion on the way in and on the way out.
Aun Weor states that the solar bodies are formed in the same manner that physical bodies are formed: through use of the sexual function. In order to form the solar bodies, sexual transmutation is taught via the hetero sexual magic of married couples engaged in coitus without orgasm or seminal ejaculation. Sexual magic is the arousal of sexual energies through the act of coitus between husband and wife, but instead of expelling those energies through orgasm they are transmuted into higher octaves of energy. Each successive Solar Body is the result of the saturation of transmuted sexual energy at its respective octave: first, the "Christ Astral" is formed by transmuting the sex energy into a second octave; second, the "Christ Mind" is formed by saturating, condensing or crystallizing the sexual energy into a third octave, and the causal body or "Christ Will" is formed by transmuting the sexual energy called "Hydrogen SI-12", into a fourth octave. The "birth" of the solar bodies is what Samael Aun Weor states is the true meaning of being "born again." It is taught that the solar bodies are referred to in the Bible as the three sons of Noah or the three Christians in the (alchemical) furnace of Nebuchadnezzar.The topic of sexuality is approached from a very stern point of view, and it is indeed the crux of Aun Weor’s entire message. He states that there are three fundamental types of sexuality: suprasexuality, which is the sexual functioning of someone like Buddha or Jesus, who naturally transmutes all their energy perfectly; normal sexuality, which is defined as those who have no sexual conflict of any kind whatsoever and who transmute their sexual energy or use it to procreate the species; finally, the two spheres of infrasexuality, as described in the Kabbalistic texts: Nahemah's sphere of influence which includes fornication, adultery, addiction and prostitution and Lilith's sphere of influence, a category which includes homosexuality, masturbation, abortion, bestiality, sado-masochism and any other "abuse" of the sexual energy. In response to his supposedly harsh views towards sex (especially for a "New Age" teacher), he wrote: