/ enərdʒi /
energy je nebrojiva imenica
vim · vitality · vigor · vigour · vigor · vigour · vim · push · get-up-and-go
DOE · Department of Energy · Energy · Energy Department · get-up-and-go · muscularity · push · vigor · vigour · vim · vitality · zip
Prevedi energy na: francuski · nemački
ETYM French énergie, Late Lat. energia, from Greek energeia; en in + ergon work. Related to In, and Work.
Capacity for doing work. Potential energy (PE) is energy deriving from position; thus a stretched spring has elastic PE, and an object raised to a height above the Earth's surface, or the water in an elevated reservoir, has gravitational PE. A lump of coal and a tank of gasoline, together with the oxygen needed for their combustion, have chemical energy. Other sorts of energy include electrical and nuclear energy, and light and sound. Moving bodies possess kinetic energy (KE). Energy can be converted from one form to another, but the total quantity stays the same (in accordance with the conservation of energy principle). For example, as an apple falls, it loses gravitational PE but gains KE.
Although energy is never lost, after a number of conversions it tends to finish up as the kinetic energy of random motion of molecules (of the air, for example) at relatively low temperatures. This is “degraded” energy that is difficult to convert back to other forms.
So-called energy resources are stores of convertible energy. Nonrenewable resources include the fossil fuels (coal, oil, and gas) and nuclear-fission “fuels”— for example, uranium-235. Renewable resources, such as wind, tidal, and geothermal power, have so far been less exploited. Hydroelectric projects are well established, and wind turbines and tidal systems are being developed.
E=mc2 Einstein’s special theory of relativity 1905 correlates any gain, E, in energy with a gain, m, in mass, by the equation E = mc2, in which c is the speed of light. The conversion of mass into energy in accordance with this equation is the basis of nuclear power. The equation applies universally, not just to nuclear reactions, although it is only for these that the percentage change in mass is large enough to detect.
1. (Physics) The capacity of a physical system to do work; the units of energy are joules or ergs.
2. Any form of power, such as electrical energy, nuclear energy.
3. A healthy capacity for vigorous activity; SYN. vim, vitality.
4. An exertion of force; SYN. vigor, vigour.
5. An imaginative lively style (especially style of writing); SYN. vigor, vigour, vim.
6. Enterprising or ambitious drive; SYN. push, get-up-and-go.
1. Delatnost, radionost;
2. fiz. Sposobnost za vršenje rada; kinetička ili aktuelna energija, energija kretanja, tj. spsobnost mase da izvrši rad usled svoje pokrenutosti; potencijalna energija, sposobnost za vršenje rada koju ima masa na osnovu svoga položaja, kad je dignuta izna tla i sposobna da pada. Oblici energije su: toplotnoa, magnetna, električna energija. Princip (ili zakon) održanja energije: "Priroda kao celina ima zalihu energije koja se nikako ne može ni povećati ni smanjiti, dakle, količina enrgi