oil was first used as an energy source in the fourth century bce.
oil was first used as an energy source in the fourth century bce.
when was oil first used as an energy source?
fourth century bce
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in the field of energetics, an energy carrier is produced by human technology from a primary energy source. only the energy sector uses primary energy sources. other sectors of society use an energy carrier to perform useful activities (end-uses). the distinction between "energy carriers" (ec) and "primary energy sources" (pes) is extremely important. 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 til 3 mj of oil. sunlight is a main of primary energy, which can be transformed into plants and then into coal, oil and gas. solar power and wind power are other derivatives of sunlight. note that although coal, oil and natural gas are derived from sunlight, they are considered primary energy sources which are extracted from the earth (fossil fuels). natural uranium is also a primary energy source extracted from the earth but does not come from the decomposition of organisms (mineral fuel).
energy carrier