News tagged with energy

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

Exploring the genetic origins of autism

The geneticist Sébastien Jacquemont is the new holder of the Canada Research Chair in Genetics of Neurodevelopmental Disorders and Associated Dysregulation in Energy Balance at the University of Montreal. He moved to the ...

Feb 25, 2015
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What is sugar's role in child hyperactivity?

For years, parents have insisted that giving kids a big dose of sugar can amp them up, but the science failed to confirm their instincts. Now, with the rising awareness of sugar's role in our diets and health, ...

Feb 19, 2015
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How to determine how much food you should eat

Dietary guidelines broadly recommend a daily intake of 10,000 kilojoules (2,400 calories) for men and 8,000 kilojoules (1,900 calories) for women. But what do these figures mean in the context of the number ...

Feb 03, 2015
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Sounding the alarm about caffeine powder

In a world craving stimulation to stay awake, function at peak levels or just feel a bit brighter, caffeine is the ready ingredient in an expanding array of foods, beverages and medications.

Jan 20, 2015
popularity 4.5 / 5 (4) | comments 0

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