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.
is the source of energy for most of life on Earth. As a star, the Sun is heated to high temperatures by the conversion of nuclear binding energy
due to the fusion of hydrogen in its core. This energy is ultimately transferred
(released) into space mainly in the form of radiant (light) energy
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. 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 SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.
Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object's position in a force field (gravitational, electric or magnetic), the elastic energy stored by stretching solid objects, the chemical energy released when a fuel burns, the radiant energy carried by light, and the thermal energy due to an object's temperature.
Mass and energy are closely related. 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. For example, after heating an object, its increase in energy could be measured as a small increase in mass, with a sensitive enough scale.
Living organisms require exergy to stay alive, such as the energy humans get from food. Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The processes of Earth's climate and ecosystem are driven by the radiant energy Earth receives from the sun and the geothermal energy contained within the earth.
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. Read more...
Did you know?
- Despite declines in production in recent years, Victoria still produces almost 20% of Australia's crude oil?
- 4.26 million tonnes of the sun are converted to energy every second by nuclear fusion?
Amory Bloch Lovins
(born November 13, 1947) is an American physicist, environmental scientist, writer, and Chairman/Chief Scientist of the Rocky Mountain Institute
. He has worked in the field of energy policy
and related areas for four decades. He was named by Time
magazine one of the World's 100 most influential people in 2009.
Lovins worked professionally as an environmentalist in the 1970s and since then as an analyst of a "soft energy path" for the United States and other nations. He has promoted energy efficiency, the use of renewable energy sources, and the generation of energy at or near the site where the energy is actually used. Lovins has also advocated a "negawatt revolution" arguing that utility customers don't want kilowatt-hours of electricity; they want energy services. In the 1990s, his work with Rocky Mountain Institute included the design of an ultra-efficient automobile, the Hypercar.
Lovins does not see his energy ideas as green or left-wing, and he is an advocate of private enterprise and free market economics. He notes that Rupert Murdoch has made News Corporation carbon-neutral, with savings of millions of dollars. But, says Lovins, large institutions are becoming more "gridlocked and moribund", and he supports the rise of "citizen organizations" around the world.
Lovins has received ten honorary doctorates and won many awards. He has provided expert testimony in eight countries, briefed 19 heads of state, and published 29 books. These books include Reinventing Fire, Winning the Oil Endgame, Small is Profitable, Brittle Power, and Natural Capitalism. Read more...
In the news
- 4 July 2019 -
- Lightsource BP, a solar energy developer headquartered in London, has announced that it will acquire utility-scale solar projects in Brazil, 1.9 gigawatts of projects, for an undisclosed sum. This is a major expansion for Lightsource, which is 43% owned by the energy giant BP. (Reuters)
- "Our decision about energy will test the character of the American people and the ability of the President and the Congress to govern this Nation. This difficult effort will be the 'moral equivalent of war', except that we will be uniting our efforts to build and not to destroy." - Jimmy Carter, 1977
- "For generations, we have assumed that the efforts of mankind would leave the fundamental equilibrium of the world's systems and atmosphere stable. But it is possible that with all these enormous changes (population, agricultural, use of fossil fuels) concentrated into such a short period of time, we have unwittingly begun a massive experiment with the system of this planet itself." - Margaret Thatcher, 1998
- "A great nation like the United States has a duty not to obstruct the fight against global warming but should, on the contrary, lead the combat, because what is at stake is the fate of all humanity." - Nicolas Sarkozy, 2007
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