News tagged with energy

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

Modeling the brain's energy

Scientists at EPFL, KAUST and UCL have created the first computer model of the metabolic coupling between neuron and glia, an essential feature of brain function. Confirming previous experimental data, the ...

Mar 25, 2015
popularity 20 comments 0

Teenage TV audiences and energy drink advertisements

Researchers at Dartmouth College examined a database of television advertisements broadcast between March 2012 and February 2013 on 139 network and cable channels and found that more than 608 hours of advertisements for energy ...

Mar 06, 2015
popularity 6 comments 0

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
popularity 142 comments 1

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