Portal:Energy

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The Energy Portal
Welcome to Wikipedia's Energy portal, your gateway to energy. This portal is aimed at giving you access to all energy related topics in all of its forms.
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Introduction

A plasma globe, using electrical energy to create plasma, light, heat, movement and a faint sound

In physics, energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity—the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The unit of measurement for energy in the International System of Units (SI) is the joule (J).

Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object (for instance due to its position in a field), the elastic energy stored in a solid object, chemical energy associated with chemical reactions, the radiant energy carried by electromagnetic radiation, and the internal energy contained within a thermodynamic system. All living organisms constantly take in and release energy.

Due to mass–energy equivalence, any object that has mass when stationary (called rest mass) also has an equivalent amount of energy whose form is called rest energy, and any additional energy (of any form) acquired by the object above that rest energy will increase the object's total mass just as it increases its total energy.

Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The Earth's climate and ecosystems processes are driven by the energy the planet receives from the Sun (although a small amount is also contributed by geothermal energy). (Full article...)

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Ethanol fuel in Brazil provides a ~22% ethanol blend used nationwide, plus 100% hydrous ethanol for four million cars. The Brazilian ethanol program provided nearly 700,000 jobs in 2003, and cut 1975–2002 oil imports by a cumulative undiscounted total of US$50 billion. Brazil gets more than 30% of its automobile fuels from sugar cane-based ethanol.

The Brazilian government provided three important initial drivers for the ethanol industry: guaranteed purchases by the state-owned oil company Petrobras, low-interest loans for agro-industrial ethanol firms, and fixed gasoline and ethanol prices where hydrous ethanol sold for 59% of the government-set gasoline price at the pump. These pump-primers have made ethanol production competitive yet unsubsidized.

In recent years, the Brazilian untaxed retail price of hydrous ethanol has been lower than that of gasoline per gallon. Approximately US$50 million has recently been allocated for research and projects focused on advancing the obtention of ethanol from sugarcane in São Paulo.

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Photo credit: Senior Airman Joshua Strang, United States Air Force
An aurora, caused by the release of energy as charged particles collide with atoms in the Earth's upper atmosphere.

Did you know?

An incandescent light bulb
An incandescent light bulb
  • Saudi Aramco is the largest oil corporation in the world and the world's largest in terms of proven crude oil reserves and production?

Selected biography

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John Davison Rockefeller, Sr. (July 8, 1839 – May 23, 1937) was a controversial American industrialist who revolutionized the oil industry and defined the structure of modern philanthropy. He is often regarded as the richest person in history.

Rockefeller founded the Standard Oil Company in 1870 and ran it until he retired in the late 1890s. He continued to retain his stock and his title as president until 1911, when the company was broken up for carrying out illegal monopoly practices. The new companies formed included the predecessors of Conoco, Amoco, Chevron, Esso, Mobil and Sohio. Rockefeller, who had rarely sold shares, owned stock in all of them. As gasoline had grown in importance his wealth had soared and he became the world's richest man and the first billionaire.

Rockefeller's fortune was used to create the modern systematic approach of targeted philanthropy with foundations that had a major impact on medicine, education, and scientific research. His foundations pioneered the development of medical research, and was instrumental in the eradication of hookworm and yellow fever. At his death, at the age of 98, Rockefeller's remaining fortune was estimated at $1.4 billion. As a percentage of the United States economy, no other American fortune has ever come close.


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