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An energy carrier can be more valuable (have a higher quality) than a primary energy source. For example 1 megajoule (MJ) of electricity produced by a hydroelectric plant is equivalent to 3 MJ of oil. [4] Sunlight is a main source of primary energy, which can be transformed into plants and then into coal, oil and gas.
The International Recommendations for Energy Statistics (IRES) prefers total energy supply (TES) to refer to this indicator. [4] These expressions are often used to describe the total energy supply of a national territory. Secondary energy is a carrier of energy, such as electricity. These are produced by conversion from a primary energy source.
During the 12-month period through August 2016, natural gas generated 34.5 percent of US electricity, versus 29.8 percent for coal. [ 28 ] Unlike the other sectors of natural gas consumption, the electrical power industry uses more natural gas in the summer, when electricity demand is increased by air conditioning, and when natural gas prices ...
Nuclear energy – energy in the nucleus or core of atoms [1] Nuclear fusion; Nuclear reactor; Nuclear reprocessing; Oil drilling; Oil platform; Oil refinery; Oil shale; Oil well; Osmotic power – or salinity gradient power – is the energy available from the difference in the salt concentration between seawater and river water. OTEC ...
A source of primary energy, an energy form found in nature that has not been subjected to any conversion or transformation process; Energy carrier, or secondary energy, a substance or phenomenon that contains energy that can be later converted to other forms such as mechanical work or heat or to operate chemical or physical processes
Form C contacts ("change over" or "transfer" contacts) are composed of a normally closed contact pair and a normally open contact pair that are operated by the same device; there is a common electrical connection between a contact of each pair that results in only three connection terminals.
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The paper industry was second at 6.5 billion BTU per employee. Each of these handles energy sources as part of their raw materials (fossil fuels and wood). [63] The same survey found that half of the electric use was to drive machines and about 10% each for heating, cooling and electro-chemical processes.