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Energy Deutsch

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Examples of energy transformation include generating electric energy from heat energy via a steam turbine, or lifting an object against gravity using electrical energy driving a crane motor.

Lifting against gravity performs mechanical work on the object and stores gravitational potential energy in the object.

If the object falls to the ground, gravity does mechanical work on the object which transforms the potential energy in the gravitational field to the kinetic energy released as heat on impact with the ground.

Our Sun transforms nuclear potential energy to other forms of energy; its total mass does not decrease due to that in itself since it still contains the same total energy even if in different forms , but its mass does decrease when the energy escapes out to its surroundings, largely as radiant energy.

There are strict limits to how efficiently heat can be converted into work in a cyclic process, e. 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.

Energy transformations in the universe over time are characterized by various kinds of potential energy that has been available since the Big Bang later being "released" transformed to more active types of energy such as kinetic or radiant energy when a triggering mechanism is available.

Familiar examples of such processes include nuclear decay, in which energy is released that was originally "stored" in heavy isotopes such as uranium and thorium , by nucleosynthesis , a process ultimately using the gravitational potential energy released from the gravitational collapse of supernovae , to store energy in the creation of these heavy elements before they were incorporated into the solar system and the Earth.

This energy is triggered and released in nuclear fission bombs or in civil nuclear power generation. Similarly, in the case of a chemical explosion , chemical potential energy is transformed to kinetic energy and thermal energy in a very short time.

Yet another example is that of a pendulum. At its highest points the kinetic energy is zero and the gravitational potential energy is at maximum.

At its lowest point the kinetic energy is at maximum and is equal to the decrease of potential energy. If one unrealistically assumes that there is no friction or other losses, the conversion of energy between these processes would be perfect, and the pendulum would continue swinging forever.

This is referred to as conservation of energy. In this closed system, energy cannot be created or destroyed; therefore, the initial energy and the final energy will be equal to each other.

This can be demonstrated by the following:. Energy gives rise to weight when it is trapped in a system with zero momentum, where it can be weighed.

It is also equivalent to mass, and this mass is always associated with it. Mass is also equivalent to a certain amount of energy, and likewise always appears associated with it, as described in mass-energy equivalence.

In different theoretical frameworks, similar formulas were derived by J. Part of the rest energy equivalent to rest mass of matter may be converted to other forms of energy still exhibiting mass , but neither energy nor mass can be destroyed; rather, both remain constant during any process.

Conversely, the mass equivalent of an everyday amount energy is minuscule, which is why a loss of energy loss of mass from most systems is difficult to measure on a weighing scale, unless the energy loss is very large.

Examples of large transformations between rest energy of matter and other forms of energy e. Thermodynamics divides energy transformation into two kinds: reversible processes and irreversible processes.

An irreversible process is one in which energy is dissipated spread into empty energy states available in a volume, from which it cannot be recovered into more concentrated forms fewer quantum states , without degradation of even more energy.

A reversible process is one in which this sort of dissipation does not happen. For example, conversion of energy from one type of potential field to another, is reversible, as in the pendulum system described above.

In this case, the energy must partly stay as heat, and cannot be completely recovered as usable energy, except at the price of an increase in some other kind of heat-like increase in disorder in quantum states, in the universe such as an expansion of matter, or a randomisation in a crystal.

As the universe evolves in time, more and more of its energy becomes trapped in irreversible states i.

This has been referred to as the inevitable thermodynamic heat death of the universe. In this heat death the energy of the universe does not change, but the fraction of energy which is available to do work through a heat engine , or be transformed to other usable forms of energy through the use of generators attached to heat engines , grows less and less.

The fact that energy can be neither created nor be destroyed is called the law of conservation of energy.

In the form of the first law of thermodynamics , this states that a closed system 's energy is constant unless energy is transferred in or out by work or heat , and that no energy is lost in transfer.

The total inflow of energy into a system must equal the total outflow of energy from the system, plus the change in the energy contained within the system.

Whenever one measures or calculates the total energy of a system of particles whose interactions do not depend explicitly on time, it is found that the total energy of the system always remains constant.

While heat can always be fully converted into work in a reversible isothermal expansion of an ideal gas, for cyclic processes of practical interest in heat engines the second law of thermodynamics states that the system doing work always loses some energy as waste heat.

This creates a limit to the amount of heat energy that can do work in a cyclic process, a limit called the available energy. Mechanical and other forms of energy can be transformed in the other direction into thermal energy without such limitations.

Richard Feynman said during a lecture: [14]. There is a fact, or if you wish, a law , governing all natural phenomena that are known to date.

There is no known exception to this law — it is exact so far as we know. The law is called the conservation of energy. It states that there is a certain quantity, which we call energy, that does not change in manifold changes which nature undergoes.

That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity which does not change when something happens.

It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number and when we finish watching nature go through her tricks and calculate the number again, it is the same.

Most kinds of energy with gravitational energy being a notable exception [15] are subject to strict local conservation laws as well. In this case, energy can only be exchanged between adjacent regions of space, and all observers agree as to the volumetric density of energy in any given space.

There is also a global law of conservation of energy, stating that the total energy of the universe cannot change; this is a corollary of the local law, but not vice versa.

This law is a fundamental principle of physics. As shown rigorously by Noether's theorem , the conservation of energy is a mathematical consequence of translational symmetry of time, [16] a property of most phenomena below the cosmic scale that makes them independent of their locations on the time coordinate.

Put differently, yesterday, today, and tomorrow are physically indistinguishable. This is because energy is the quantity which is canonical conjugate to time.

This mathematical entanglement of energy and time also results in the uncertainty principle - it is impossible to define the exact amount of energy during any definite time interval.

The uncertainty principle should not be confused with energy conservation - rather it provides mathematical limits to which energy can in principle be defined and measured.

Each of the basic forces of nature is associated with a different type of potential energy, and all types of potential energy like all other types of energy appears as system mass , whenever present.

For example, a compressed spring will be slightly more massive than before it was compressed. Likewise, whenever energy is transferred between systems by any mechanism, an associated mass is transferred with it.

In quantum mechanics energy is expressed using the Hamiltonian operator. On any time scales, the uncertainty in the energy is by.

In particle physics , this inequality permits a qualitative understanding of virtual particles which carry momentum , exchange by which and with real particles, is responsible for the creation of all known fundamental forces more accurately known as fundamental interactions.

Virtual photons which are simply lowest quantum mechanical energy state of photons are also responsible for electrostatic interaction between electric charges which results in Coulomb law , for spontaneous radiative decay of exited atomic and nuclear states, for the Casimir force , for van der Waals bond forces and some other observable phenomena.

Energy transfer can be considered for the special case of systems which are closed to transfers of matter. The portion of the energy which is transferred by conservative forces over a distance is measured as the work the source system does on the receiving system.

The portion of the energy which does not do work during the transfer is called heat. Examples include the transmission of electromagnetic energy via photons, physical collisions which transfer kinetic energy , [note 5] and the conductive transfer of thermal energy.

Energy is strictly conserved and is also locally conserved wherever it can be defined. In thermodynamics, for closed systems, the process of energy transfer is described by the first law : [note 6].

This simplified equation is the one used to define the joule , for example. Beyond the constraints of closed systems, open systems can gain or lose energy in association with matter transfer both of these process are illustrated by fueling an auto, a system which gains in energy thereby, without addition of either work or heat.

Internal energy is the sum of all microscopic forms of energy of a system. It is the energy needed to create the system. It is related to the potential energy, e.

Thermodynamics is chiefly concerned with changes in internal energy and not its absolute value, which is impossible to determine with thermodynamics alone.

The first law of thermodynamics asserts that energy but not necessarily thermodynamic free energy is always conserved [18] and that heat flow is a form of energy transfer.

For homogeneous systems, with a well-defined temperature and pressure, a commonly used corollary of the first law is that, for a system subject only to pressure forces and heat transfer e.

This equation is highly specific, ignoring all chemical, electrical, nuclear, and gravitational forces, effects such as advection of any form of energy other than heat and pV-work.

The general formulation of the first law i. For these cases the change in internal energy of a closed system is expressed in a general form by.

The energy of a mechanical harmonic oscillator a mass on a spring is alternatively kinetic and potential energy.

At two points in the oscillation cycle it is entirely kinetic, and at two points it is entirely potential. Over the whole cycle, or over many cycles, net energy is thus equally split between kinetic and potential.

This is called equipartition principle ; total energy of a system with many degrees of freedom is equally split among all available degrees of freedom.

This principle is vitally important to understanding the behaviour of a quantity closely related to energy, called entropy. Entropy is a measure of evenness of a distribution of energy between parts of a system.

When an isolated system is given more degrees of freedom i. This mathematical result is called the second law of thermodynamics.

The second law of thermodynamics is valid only for systems which are near or in equilibrium state. For non-equilibrium systems, the laws governing system's behavior are still debatable.

One of the guiding principles for these systems is the principle of maximum entropy production. From Wikipedia, the free encyclopedia. This article is about the scalar physical quantity.

For an overview of and topical guide to energy, see Outline of energy. For other uses, see Energy disambiguation. For other uses, see Energetic disambiguation.

Physical property transferred to objects to perform heating or work. The Sun is the source of energy for most of life on Earth.

It derives its energy mainly from nuclear fusion in its core, converting mass to energy as protons are combined to form helium. This energy is transported to the sun's surface then released into space mainly in the form of radiant light energy.

The classical Carnot heat engine. Classical Statistical Chemical Quantum thermodynamics. Zeroth First Second Third.

System properties. Note: Conjugate variables in italics. Charlotte Rudolph Burak Atakan. Sven Werner. Guruprasad Alva Yaxue Lin Three-dimensional unsteady stator-rotor interactions in high-expansion organic Rankine cycle turbines - Open access Gustavo J.

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And what can we do for you? The energy transition calls for innovation and a fresh mindset. Our current level of energy consumption must be halved as quickly as possible.

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