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  • WordNet 3.6
    • n energy an imaginative lively style (especially style of writing) "his writing conveys great energy","a remarkable muscularity of style"
    • n energy enterprising or ambitious drive "Europeans often laugh at American energy"
    • n energy forceful exertion "he plays tennis with great energy","he's full of zip"
    • n Energy the federal department responsible for maintaining a national energy policy of the United States; created in 1977
    • n energy any source of usable power "the DOE is responsible for maintaining the energy policy"
    • n energy (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs "energy can take a wide variety of forms"
    • n energy a healthy capacity for vigorous activity "jogging works off my excess energy","he seemed full of vim and vigor"
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Japan uses the most energy per year than any other country.
    • Energy (Physics) Capacity for performing work.
    • Energy Internal or inherent power; capacity of acting, operating, or producing an effect, whether exerted or not; as, men possessing energies may suffer them to lie inactive. "The great energies of nature are known to us only by their effects."
    • Energy Power efficiently and forcibly exerted; vigorous or effectual operation; as, the energy of a magistrate.
    • Energy Strength of expression; force of utterance; power to impress the mind and arouse the feelings; life; spirit; -- said of speech, language, words, style; as, a style full of energy .
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Energy is being wasted if a toaster is left plugged in after use
    • n energy The actual exertion of power; power exerted; strength in action; vigorous operation.
    • n energy Activity considered as a characteristic; habitual putting forth of power or strength, physical or mental, or readiness to exert it.
    • n energy The exertion of or capacity for a particular kind of force; action or the power of acting in any manner; special ability or agency: used of the active faculties or modes of action regarded severally, and often in the plural: as, creative energy; the energies of mind and body.
    • n energy In the Aristotelian philos., actuality; realization; existence; the being no longer in germ or in posse, but in life or in esse: opposed to power, potency, or potentiality. Thus, first energy is the state of acquired habit; second energy, the exercise of a habit: one when he has learned to sing is a singer in first energy; when he is singing, he is a singer in second energy. See act.
    • n energy A fact of acting or actually being.
    • n energy In rhetoric, the quality of awakening the imagination of the reader or hearer, and bringing the meaning of what is said home to him; liveliness.
    • n energy In physics: Half the sum of the masses of the particles of a system each multiplied by the square of its velocity; half the vis viva. See vis viva. This sense, introduced by Dr. Thomas Young, is now obsolete. It gave rise to the following, which was introduced about 1850 by Sir William Thomson, and is now widely current.
    • n energy Half the greatest value to which the sum of the masses of all the particles of a given system each multiplied by the square of its velocity, could attain except for friction, viscosity, and other forces dependent on the velocities of the particles; otherwise, the amount of work (see work) which a given system could perform were it not for resistance dependent on the velocities. The law of energy is precisely the principle that these two definitions are equivalent. This law applies solely to forces dependent alone on the relative positions of particles—that is, to attractions, repulsions, and their resultants. It is shown mathematically that, taking any two level or equipotential surfaces (see equipotential) which a particle might traverse in its motion, the difference of the squares of its velocities as it passed through them would be the same no matter from what point of space it started, nor what might be the direction and velocity of its initial motion. Thus, the square of the velocity at any instant could be deduced from that at any other by simply adding or subtracting a quantity dependent merely on the positions at these instants. In like manner, if a number of particles were moving about, subject to mutual attractions and repulsions, it is shown in dynamics that if to the sum of the masses, each multiplied by the square of its velocity, be added a certain quantity dependent only on the positions of the particles at that instant, this last sum would remain constant throughout the motion. Of these quantities, half the mass of a particle into the square of its velocity is termed its actual energy, or energy of motion— that is, its kinetic activity; while the quantity to be added to the sum of the actual energy in order to obtain a constant sum is termed the potential energy— that is, the latent or slumbering activity, or energy of position; the constant sum being termed the total energy. The corresponding general principle of physics is that the total energy of the physical universe is constant; this is the principle of the persistence or conservation of energy. (See below.) Examples of actual energy are the energy of sensible motion as in a moving cannon-ball, of sound-waves, of heat; of potential energy, the energy of position of a weight raised above the earth, of elasticity as in a bent bow, of electricity, chemical combination, etc. Potential or positional energy and actual or kinetic energy are in incessant interconversion; for positional energy implies force, or a tendency to motion, as much as kinetic energy implies motion or change of position. Thus, in the case of a swinging pendulum, the actual energy is null at the turning-points at the extremities of the swing, while the potential energy is at its minimum when the center of gravity is lowest; and the oscillation, but for resistances (as friction), would continue forever. Another equivalent version of the law of energy is as follows: Suppose a system of bodies were moving under the influence of those positional forces to which the law exclusively applies, and suppose that at any one instant all the particles were to strike squarely against elastic surfaces so as to have the directions of their motions reversed, but their velocities otherwise unaltered; then the whole series of motions would be performed backward, so that the particles would again pass through the same positions they had already passed through, and in the same intervals of time, but in the reverse order. Thus, a squarely rebounding cannonball in vacuo would move backward over the same trajectory, and with the same velocities, as in its forward motion, plunging into the mouth of the cannon again with exactly the velocity with which it had issued.
    • n energy of water in motion, or in an elevated position;
    • n energy of air in motion, as the wind;
    • n energy the muscular energy of animals. To these might be added the energy of direct solar radiation, the energy of the tides, and some others of less importance. The source of all these forms of energy, except that of the tides, is to be found in the radiant energy of the sun.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: An insect exerts so much energy in one hour of flying that it may lose as much as a third of its total body weight.
    • n Energy en′ėr-ji power of doing work: power exerted: vigorous operation: strength:
    • v.i Energy to act with force:—pr.p. en′ergīsing; pa.p. en′ergīsed
    • n Energy en′ėr-ji (physics) the term, as applied to a material system, used to denote the power of doing work possessed by that system
    • ***


  • Thomas J. Peters
    “Winners must learn to relish change with the same enthusiasm and energy that we have resisted it in the past.”
  • Woodrow T. Wilson
    “I believe in democracy, because it releases the energies of every human being.”
  • Don G. Mitchell
    Don G. Mitchell
    “There is no genius in life like the genius of energy and industry.”
  • Aristotle
    “The energy of the mind is the essence of life.”
  • Smiley Blanton
    Smiley Blanton
    “Love is the immortal flow of energy that nourishes, extends and preserves. Its eternal goal is life.”
  • Leo Buscaglia
    “Don't hold to anger, hurt or pain. They steal your energy and keep you from love.”


Webster's Revised Unabridged Dictionary
F. énergie, LL. energia, fr. Gr., fr. active; in + work. See In, and Work
Chambers's Twentieth Century Dictionary
Gr. energeiaen, in, ergon, work.


In literature:

His energy was unceasing, his perseverance indomitable.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
Invincible industry and energy were united with these dreams.
"Madame Roland, Makers of History" by John S. C. Abbott
He directed almost his chief energies to this object, to keep off all foreign influences from his well-ordered kingdom.
"A History of England Principally in the Seventeenth Century, Volume I (of 6)" by Leopold von Ranke
With deadly accuracy they released the energy of their ray pistols.
"The Copper-Clad World" by Harl Vincent
But will they have the energy?
"Diary from March 4, 1861, to November 12, 1862" by Adam Gurowski
Yet Stephen owes a small niche in history to another cause, upon which he bestowed no little energy.
"The Life of Sir James Fitzjames Stephen, Bart., K.C.S.I." by Sir Leslie Stephen
But De Soto, whose youthful energies were inspired by love and ambition, was eager to press forward.
"Ferdinand De Soto, The Discoverer of the Mississippi" by John S. C. Abbott
The discharge from the motors is a harmless stream of energy particles.
"Astounding Stories of Super-Science July 1930" by Various
The translatory energy of the train is transformed into the molecular energy called heat.
"The Machinery of the Universe" by Amos Emerson Dolbear
But there are no energies like the energies of despair.
"King Philip" by John S. C. (John Stevens Cabot) Abbott
It continued to feed on the soil and on the Sun's energy.
"The Leech" by Phillips Barbee
They are undoubtedly wanting in energy.
"Ireland as It Is" by Robert John Buckley (AKA R.J.B.)
This combining (burning or oxidizing) gives us our body heat and the energy to move.
"Common Science" by Carleton W. Washburne
It results that such energies, remaining virtual, have no practical importance.
"The Sexual Question" by August Forel
They exhibit only the energies of an admirable impulse, without the control of a guiding law.
"The Truth About Woman" by C. Gasquoine Hartley
The pulsing energies and exhilaration of youth are his again!
"Elementary Theosophy" by L. W. Rogers
Anna's attempt to make it up when she said good-night was repulsed with energy.
"The Benefactress" by Elizabeth Beauchamp
The only real energy there is or can be is the energy of the infinite mind we call God.
"Carmen Ariza" by Charles Francis Stocking
From ten o'clock in the morning until five o'clock in the evening the huge Portland Place house absorbed her energies.
"The Duchess of Wrexe" by Hugh Walpole
The chlorophylls are, of course, the regulator of photosynthesis, absorbing solar energy with which the photosynthetic process may be brought about.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher

In poetry:

We know he has much moral force;
Much that is good and great;
Much enterprise and energy,
Which we would imitate.
"Lines Of Annexation" by Nora Pembroke
But each passing hour must waken
Energies that slumber now,
Manhood with its fire and action
Stamp that fair, unfurrowed brow.
"Lines To D. G. T., Of Sherwood" by Mary Gardiner Horsford
Is it for this, that on one work
My soul's whole energy I cast?
Thought! ardour! feeling! hope! and joy!
And gave my life at last!
"The Painter Of Florence" by Ernest Jones
For with him, like a prophecy that raves
Of some wild fruitful deed,
Go the great energies that kneel like slaves
Wherever men have need.
"To My Readers" by Alexander Anderson
Where stirs the energy they knew?
Joins it the forces undestroyed
That urge the suns within the void,
And shake the star in evening's dew?
"The Testimony of the Suns" by George Sterling
Oh, may their graceful figures long
Their youthful energy retain,
And may they meet no heartless wrong,
To fill their gentle souls with pain.
"Kelvin" by Thomas Frederick Young

In news:

David Danielson, US Assistant Secretary of Energy (left), and Richard Heath, Director of Energy Innovations and Projects for Supervalu, at the Carpinteria Albertsons.
While renewable energy is an important part of the Illinois Renewable Energy and Sustainable Lifestyle Fair with exhibits and workshops, visitors this year seemed excited by what the presenters had to tell them about self-sufficiency .
Daylighting generates energy savings by limiting electrical lighting, but the increased solar energy can strain HVAC systems and sacrifice occupant comfort.
The Department of Energy's Advanced Research Projects Agency announced its first grant awards Monday morning, handing out more than $150 million for what the agency describes as "bold, transformational" energy projects.
Complete energy measurement SoC from Maxim Integrated Products released as companies seek to meet new EPA/Energy Star mandates for greater energy efficiency.
A $3 million solar energy installation to help power General Motors Co.'s Detroit-Hamtramck assembly plant was formally announced Wednesday by GM and DTE Energy Co.
Solar thermal energy appears poised for a renaissance in the United States, as the Obama Administration presses forward with its green energy agenda.
Mayor Jerramiah T Healy announced Friday that the Federal Energy Regulatory Commission (FERC) has agreed to rehear the city's legal petition regarding the Spectra Energy's natural gas pipeline.
A state commission yesterday approved Spectra Energy's proposal to run a section of the Houston energy giant's controversial natural gas pipeline below ground in Liberty State Park in Jersey City.
JERSEY CITY AND BEYOND – The Federal Energy Regulatory Commission (FERC) today unanimously approved, with conditions, the New Jersey-New York Project proposed by Texas-based Spectra Energy.
Spectra Energy Corp. Has entered into multiyear agreements with Progress Energy Resources Corp. To provide a total 370 MMcfd of natural gas gathering and processing services for Montney shale production in northeast British Columbia.
Disruptions to supply and ever-increasing demand are the two main energy stories of 2011, according to the BP Statistical Review of World Energy 2012.
Energy Secretary Steven Chu said the Department of Energy is offering a $730 million conditional loan to steelmaker Severstal Dearborn, LLC, in Dearborn, MI, U.S.
Major oil companies and independents both said they see a recently passed Senate energy bill as an important step in finalizing a comprehensive US energy policy.
Partners decided to suspend work on the Yaraqui-1X well, a subsalt prospect on the Topoyaco block in the Putumayo basin foothills in Colombia, said PetroMagdalena Energy Corp. Pacific Rubiales Energy Corp.

In science:

Moreover the ”additional tensor of energy-momentum” has the form of energy-momentum tensor of ideal liquid with the state equation P1 = ǫ1/3, but with negative ”density of energy” (−ǫ1 ) and negative ”pressure” (−P1 ) .
Macroscopic Einstein equations for a system of interacting particles and their cosmological applications
The obtained mean values E, the energy resolutions σ, and the fractional energy resolutions σ/E are listed in Table 1 for the various beam energies.
Hadron Energy Reconstruction for the ATLAS Barrel Prototype Combined Calorimeter in the Framework of the Non-parametrical Method
Table 1: Mean reconstructed energy, energy resolution and fractional energy resolution for the various beam energies.
Hadron Energy Reconstruction for the ATLAS Barrel Prototype Combined Calorimeter in the Framework of the Non-parametrical Method
The second reason for identifying Θ as an energy tensor is that, added to the energy tensor of the matter, it yields a covariant energy conservation law.
Gravitational radiation, energy and reaction on quasi-spherical black holes
The energy distribution in the canonical ensemble, P (E ) ∝ D(E ) exp(−βE ), is the product of density of states D(E ) which usually increases with increase of energy rather rapidly and an exponential which decreases rather sharply with increase of energy at low temperatures.
An Introduction to Monte Carlo Simulation of Statistical physics Problem
Here the family of finite energy fluxes with fixed input, constructed from any vertex to infinity, is in general infinite, but the supremum of the energy is bounded by the supremum of the energy of the fluxes on T ′ k,n .
Classification on the average of random walks
The first definition (local) is when the energy of the graph is equal to the sum of energies of its subgraphs, the second one (superlocal), when the energy is the sum of energies of all neighborhoods of a given radius.
Gibbs and Quantum Discrete Spaces
Measured energies are about 20% lower than true energies, since the calorimeter does not collect all of the γ -ray energy.
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
For each pro jection: – Vary the energy split between the two tracks. – Filter and smooth with the new energy split. – Find the split fraction that minimizes χ2 . – In practice, this always assigns all the energy to one track.
A Search for Gamma-Ray Bursts and Pulsars, and the Application of Kalman Filters to Gamma-Ray Reconstruction
The lower-energy branch has a substantial weight and is easily identified in neutron scattering experiments, while the higher-energy one may be difficult to identify due to a deficiency of energy resolution in experiments. (iii) The anti-crossing or the gap opening20, 22) have been reproduced.
Anomaly in Spin Excitation Spectrum of Double-Exchange Systems with Randomness
If we identify Mh c2 ∼ cs δ as the relevant energy scale, we would tentatively conclude that the local-heating mechanism might become efficient for center of mass energies √s > Mh c2 or for cosmic ray energies E > 5x2 · 1014 eV where x is the value of Mh c2 in TeV.
A connection between gravity and the Higgs field
We can have an exchange between work and internal energy and we can say that the internal energy o f the System increases by a quant ity equal to the work energy term the work is transformed into heat (Heat I).
The Energy-Entropy Principle
The other sub-system, 1, exchanges energy, exchanges heat with HR and exchanges energy, exchanges work with the piston. The internal energy o f the System is the internal energy of the two sub-systems U1+U2.
The Energy-Entropy Principle
This being so, we propose the fo llowing nomenclature. The word heat is used as synonymous with internal energy. We can only have equality for the energy exchange between two sub-systems and the internal energy change of the sub-systems if there is no work.
The Energy-Entropy Principle
When the transformation is adiabat ic (the energy exchange with the heat reservoir is zero), the internal energy o f the sub-system considered changes due to the work energy term.
The Energy-Entropy Principle