News tagged with energy

Related topics: electricity , energy consumption , renewable energy , energy efficiency , fossil fuels

Study explores effects of metformin in obese children

(HealthDay)—For obese hyperinsulinemic children, metformin seems to decrease perceived hunger and increase perceived fullness, according to a study published online Dec. 8 in Diabetes, Obesity and Metabolism.

Dec 18, 2014
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Fat cells reprogrammed to increase fat burning

White adipose tissue stores excess calories as fat that can be released for use in other organs during fasting. Mammals also have small amounts of brown adipose tissue, which primarily acts as an effective ...

Dec 13, 2014
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Running really can keep you young, study says

If you are an active senior who wants to stay younger, keep on running. A new study involving the University of Colorado Boulder and Humboldt State University shows that senior citizens who run several times ...

Nov 20, 2014
popularity 4.6 / 5 (16) | comments 2

Energy

In 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.

This text uses material from Wikipedia licensed under CC BY-SA