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Secondary energy is a carrier of energy, such as electricity. These are produced by conversion from a primary energy source. Primary energy is used as a measure in energy statistics in the compilation of energy balances, [5] as well as in the field of energetics.
Closer to the customer, a distribution transformer steps the primary distribution power down to a low-voltage secondary circuit, usually 120/240 V in the US for residential customers. The power comes to the customer via a service drop and an electricity meter. The final circuit in an urban system may be less than 15 metres (50 ft) but may be ...
2 Primary energy vs secondary energy sources. 3 Very primary energy sources. 1 comment. 4 Anthropology and Physics. 10 comments. 5 Natural or statistical? 1 comment ...
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.
Regardless of technology, however, storage is but a secondary source of electricity dependent on a primary source of generation. Thus, a true cost accounting demands that the costs of both primary and secondary sources be included when the cost of storage is compared to the cost of generating electricity in real time to meet demand. [citation ...
The energy mix is a group of different primary energy sources from which secondary energy for direct use - such as electricity - is produced. [1] Energy mix refers to all direct uses of energy, such as transportation and housing, and should not be confused with power generation mix, which refers only to generation of electricity, [ 2 ] as ...
A secondary explosive is less sensitive than a primary explosive and requires substantially more energy to be initiated. Because they are less sensitive, they are usable in a wider variety of applications and are safer to handle and store.
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