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
New techniques make carbon-based integrated circuits more practical
15 hours ago |
4.9 / 5 (9) |
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(PhysOrg.com) -- Stanford engineers have built what they believe is a chip with the most advanced computing and storage elements made of carbon nanotubes to date by devising a way to root out the stubborn ...
Fermi sees brightest-ever blazar flare
15 hours ago |
4.3 / 5 (9) |
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(PhysOrg.com) -- A galaxy located billions of light-years away is commanding the attention of NASA's Fermi Gamma-ray Space Telescope and astronomers around the globe. Thanks to a series of flares that began ...
World Bank musters $5.5 billion for solar projects
12 hours ago |
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The World Bank announced Wednesday 5.5 billion dollars would be invested in solar energy projects in five countries of the Middle East and North Africa in a bid to combat climate change.
Energy efficiency technologies offer major savings
18 hours ago |
4 / 5 (2) |
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Energy efficiency technologies that exist today or that are likely to be developed in the near future could save considerable money as well as energy, says a new report from the National Research Council. Fully adopting ...
EU grants 1.5 billion euros for wind farms, carbon capture
17 hours ago |
3 / 5 (1) |
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The EU commission on Wednesday granted 1.5 billion euros (2.2 billion dollars) to offshore wind farms and carbon capture and storage schemes to help relaunch Europe's economy and cut greenhouse gas emissions.
