Related topics: power
Energy
hideIn physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.
Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.
Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.
For more information about Energy, read the full article at
Wikipedia.
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News tagged with energy
Large Hadron Collider sets new power world record
12 hours ago |
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(PhysOrg.com) -- CERN's Large Hadron Collider has today become the world's highest energy particle accelerator, having accelerated its twin beams of protons to an energy of 1.18 TeV in the early hours of the ...
Galician waves are best for producing energy
6 hours ago |
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The best coastal areas in the Iberian Peninsula in terms of harnessing wave energy are the Costa da Morte and Estaca de Bares, in La Coruña, Galicia, according to two pioneering studies by researchers from ...
Research shows power of FRET-based approach for distinguishing among distinct states of proteins
5 hours ago |
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In the December 2009 issue of the Journal of General Physiology, Moss et al. report a comprehensive investigation employing Förster resonance energy transfer (FRET) to study the {gamma}-amino acid (GABA) transporter GAT1, ...
NREL Uncovers Clean Energy Leaders State by State
Nov 24, 2009 |
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(PhysOrg.com) -- That California and Texas still lead the United States in generating renewable energy probably is no surprise. But, NREL's 2009 State of the States report shows that several smaller states ...
Seeking a Smarter Grid: Integrating Wind Energy by Linking Buildings to the Grid
Nov 24, 2009 |
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In utility parlance, wind energy is known as a “variable load.” That’s because wind is naturally unpredictable and inconstant. What’s worse, it is more likely to blow at night, when demand for electricity ...
ORNL 'deep retrofits' can cut home energy bills in half
Nov 25, 2009 |
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(PhysOrg.com) -- Oak Ridge National Laboratory has announced plans to conduct a series of deep energy retrofit research projects with the potential to improve the energy efficiency in selected homes by as ...
Is global warming unstoppable?
Nov 23, 2009 |
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In a provocative new study, a University of Utah scientist argues that rising carbon dioxide emissions - the major cause of global warming - cannot be stabilized unless the world's economy collapses or society builds the ...
Harnessing the power of salt, Norway tries osmotic power
Nov 23, 2009 |
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After wind, sun, currents and tides, a company is preparing to make clean electricity by harnessing another natural phenomenon, the energy-unleashing encounter of freshwater and seawater.
Sustainable Corn Production Supports Advanced Biofuel Feedstocks
Nov 25, 2009 |
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(PhysOrg.com) -- Researchers worldwide are trying to economically convert cellulosic biomass such as corn stover into "cellulosic ethanol." But Agricultural Research Service (ARS) scientists have found that ...
Invention will help speed development of drug treatments for heart failure
Nov 23, 2009 |
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Research conducted by University of Minnesota scientists, in collaboration with Celladon Corporation, has led to the invention of technology to more rapidly identify compounds for the treatment of heart failure.
How green is your house? Recycling favorite activity among Brits says new survey
Nov 23, 2009 |
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Seventy percent of households always separate their rubbish for recycling, but only 2 percent buy their energy on a green tariff, according to the early findings of a major new annual household survey, called "Understanding ...
