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Electricity

Electric power lines in Suffolk England.

Tony Boon

 Generation

 Transmission

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Phosphor-Based White LEDs: Mixed Blessings? Last Updated on 2012-01-26 00:00:00 Light-emitting diodes use less energy and last longer than even compact fluorescent lights.This article, written by Angela Spivey*, appeared first in Environmental Health Perspectives—the peer-reviewed, open access journal of the National Institute of Environmental Health Sciences.  The article is a verbatim version of the original and is not available for edits or additions by Encyclopedia of Earth editors or authors. Companion articles on the same topic that are editable may exist within the Encyclopedia of Earth. The Mixed Blessing of Phosphor-Based White LEDs Light-emitting diodes (LEDs), which use less energy and last longer than even compact fluorescent lights,1 are predicted to become the leading lighting technology in the United States as incandescent bulbs are phased out.2 But Abraham Haim, director of the Israeli Center for Interdisciplinary Studies... More »
Health impact of coal and electricity consumption Last Updated on 2011-06-20 00:00:00 Public Health Impact of Coal and Electricity Consumption: Risk–Benefit Balance Varies by Country This article, written by Tanya Tillett*, appeared first in Environmental Health Perspectives—the peer-reviewed, open access journal of the National Institute of Environmental Health Sciences The article is a verbatim version of the original and is not available for edits or additions by Encyclopedia of Earth editors or authors. Companion articles on the same topic that are editable may exist within the Encyclopedia of Earth. Access to electricity contributes to good health by powering infrastructure for clean drinking water and sanitation and by reducing the need for indoor burning of coal, wood, and other solid fuels. But these benefits can be offset by health threats posed by the emissions from... More »
Solar power Last Updated on 2010-04-25 00:00:00 Solar power is any process that generates electricity from the sun's radiation. There are two chief technologies for such electrical production: (a) photovoltaics (PV), where solar panels convert sunlight directly to electrical current; and (b) concentrating solar rays to boil water, which is used to provide power. In spite of the enthusiasm for solar plants in a few western countries, the technology requires significant subsidies to compete with fossil fuels, hydroelectric and nuclear power alternatives; in point of fact solar power supplied a mere .0002 of the world power supply as recently as 2008. Although solar is classified as a renewable energy source, there are some significant environmental impacts, including the generation of toxic cadmium residues and the significant destruction and fragmentation of natural habitats. Strides are being made in terms of... More »
Photovoltaics Last Updated on 2010-04-24 16:08:26 In recent decades the imminence of an energy crisis has become a common discussion topic. We will eventually deplete all fossil fuels that can be economically extracted.[1] Depletion is not the only issue involved in the use of fossil fuels; the combustion process releases carbon dioxide which can or is changing global climate. Fossil fuels, such as coal, natural gas, and oil, are the most common energy sources used today. When combusted to create energy, these fuels release large amounts of carbon dioxide and other greenhouse gases. These emissions cause a warming effect on the planet. The exact results of this warming are not certain, but most predictions verge on the catastrophic. In order to curb this warming effect and free ourselves from fossil fuel use, we must reduce, and ultimately replace, them as an energy source. One promising renewable energy source involves... More »