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. It derives its energy mainly from nuclear fusion
in its core, converting mass to energy as protons are combined to form helium. This energy is transported to the sun's surface then 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 energy 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.
A flexible-fuel vehicle (FFV)
(or flex-fuel vehicle
) is an alternative fuel vehicle
with an internal combustion engine
designed to run on more than one fuel
, usually gasoline
blended with either ethanol
or methanol fuel
, and both fuels are stored in the same common tank. The most common commercially available FFV in the world market is the ethanol flexible-fuel vehicle, with around 21 million automobiles
and light duty trucks
sold worldwide by mid 2010, and concentrated in four markets, Brazil
(10.6 million), the United States
(9.3 million), Canada
(more than 600,000), and Europe
, led by Sweden
(199,000). Also a total of 183,375 flexible-fuel motorcycles were sold in Brazil in 2009. In addition to flex-fuel vehicles running with ethanol, in Europe and the US, mainly in California
, there have been successful test programs with methanol flex-fuel vehicles, known as M85
Though technology exists to allow ethanol FFVs to run on any mixture of gasoline and ethanol, from pure gasoline up to 100% ethanol (E100), North American and European flex-fuel vehicles are optimized to run on a maximum blend of 15% gasoline with 85% anhydrous ethanol (called E85 fuel). This limit in the ethanol content is set to reduce ethanol emissions at low temperatures and to avoid cold starting problems during cold weather, at temperatures lower than 11 °C (52 °F). The alcohol content is reduced during the winter in regions where temperatures fall below 0 °C (32 °F) to a winter blend of E70 in the U.S. or to E75 in Sweden from November until March. Brazilian flex fuel vehicles are optimized to run on any mix of E20-E25 gasoline and up to 100% hydrous ethanol fuel (E100).
Did you know?
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.
In the news
- 12 September 2020 - Second Libyan Civil War
- The United States embassy in Libya reports that the Libyan National Army (LNA), commanded by Khalifa Haftar, has committed itself to end months-long blockade of oil facilities, saying that "the LNA had conveyed personal commitment from General Haftar to allow the full reopening of the energy sector no later than September 12". (Reuters)
- 4 September 2020 - Nuclear program of Iran
- The International Atomic Energy Agency reports that Iran has stockpiled 2,105 kilograms (4,641 lb) of enriched uranium, violating the 300 kilograms (660 lb) limit under the Joint Comprehensive Plan of Action. (DW)
- 3 September 2020 -
- United Nations Secretary General António Guterres urges Japan and other wealthy nations to give up on their reliance on fossil fuels and invest in green energy. Guterres noted that many countries are using green energy to keep global warming at 1.5 °C (2.7 °F). (AP)
- 1 September 2020 - Economic impact of the COVID-19 pandemic, COVID-19 recession
- German economic minister Peter Altmaier reports that the country's economy is facing an "unexpected" V-shaped recovery with its GDP currently forecasted to decline by 5.8% in 2020, in contrast to an earlier projection of a 6.3% decline. (AFP via Malay Mail)
- 21 August 2020 -
- Turkish President Recep Tayyip Erdo?an announced that the drilling ship Fatih has found 320 billion cubic meters of natural gas reserves in the Black Sea, Turkey's biggest natural gas find to date. If Turkey can extract the gas commercially, it will be able to reduce its reliance on imported energy. (BBC)
- 19 August 2020 - Nuclear power in the United Arab Emirates
- The first unit of the Barakah nuclear power plant in Abu Dhabi, the first nuclear power station in the Arabian Peninsula, is connected to the country's electrical grid. According to the Emirates Nuclear Energy Corporation, the completion of three more APR-1400 nuclear reactor units would result in the provision of 25% of the UAE's electricity and a reduction of carbon emissions by 21 million tons a year. (CNBC)
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