Energy conservation - Wikipedia


energy conservation articles

Conservation of energy, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant. The first kind of energy to be recognized was kinetic energy, or energy of certain particle collisions, called elastic, the sum of the kinetic energy of the particles before collision is equal to the sum of the kinetic energy of the. Energy conservation is the effort made to reduce the consumption of energy by using less of an energy service. This can be achieved either by using energy more efficiently (using less energy for a constant service) or by reducing the amount of service used (for example, by driving less). Sep 04,  · Energy Sources. News and Research. Articles on everything from hydrogen powered cars and solar energy systems to nuclear reactors and fossil fuels. Your source for .

conservation of energy | Definition & Examples |

Conservation of energyenergy conservation articles, principle of physics according to which the energy of interacting bodies or particles in a closed system remains constant, energy conservation articles. The first kind of energy to be recognized was kinetic energyor energy of motion. In certain particle collisions, called elasticthe sum of the kinetic energy of the particles before collision is equal to the sum of the kinetic energy of the particles after collision. The notion of energy was progressively widened to include other forms.

The kinetic energy lost by a body slowing down as it travels upward against the force of gravity was regarded as being converted into potential energyor stored energy, which in turn is converted back into kinetic energy as the body speeds up during its return to Earth. For example, when a pendulum swings upward, kinetic energy is converted to potential energy. When the pendulum stops briefly at the top of its swing, the kinetic energy is zero, and all the energy of the system is in potential energy.

When the pendulum swings back down, the potential energy is converted back into kinetic energy, energy conservation articles. At all times, the sum of potential and kinetic energy is constant. Frictionhowever, slows down the most carefully constructed mechanisms, thereby dissipating their energy gradually. During the s it was conclusively shown that the notion of energy could be extended to include the heat that friction generates, energy conservation articles.

The truly conserved quantity is the sum of kinetic, potential, and thermal energy. For example, when a block slides down a slope, potential energy is converted into kinetic energy. When friction slows the block to a stop, the kinetic energy is converted into thermal energy. Energy is not created or destroyed but merely changes forms, going from potential to kinetic to thermal energy.

This version of the conservation-of-energy principle, expressed in its most general form, is the first law of thermodynamics. The conception of energy continued to expand to include energy of an electric currentenergy stored in an electric or a magnetic fieldand energy in fuels and other chemicals, energy conservation articles.

For example, a car moves when the chemical energy in its gasoline is converted into kinetic energy of motion. With the advent of relativity physicsmass was first recognized as equivalent to energy. The total energy of a system of high-speed particles includes not only their rest mass but also the very significant increase in their mass as a consequence of their high speed. After the discovery of relativity, the energy-conservation principle has alternatively been named the conservation of mass-energy or the conservation of total energy.

When the principle seemed to fail, as it did when applied to the type of radioactivity called beta decay spontaneous electron ejection from atomic nucleiphysicists accepted the existence of a new subatomic particlethe neutrinothat was supposed to carry off the missing energy rather than reject the conservation principle. Later, the neutrino was experimentally detected. Energy conservation, however, is more than a general rule that persists in its validity.

It can be shown to follow mathematically from the uniformity of time. Energy conservation articles one moment of time were peculiarly different from any other moment, identical physical phenomena occurring at different moments would require different amounts of energy, so that energy would not be conserved. Conservation energy conservation articles energy. Article Media. Info Print Cite, energy conservation articles. Submit Feedback. Thank you for your feedback.

See Article History. Alternative Titles: first law of thermodynamics, law of constant energy. Read More on This Topic. The laws of thermodynamics are deceptively simple to state, but they are far-reaching in their consequences.

The first law asserts that…. Facts Matter. Start Your Free Trial Today. Learn More in these related Britannica articles: thermodynamics: The first law of thermodynamics. The first law asserts that if heat is recognized as a form of energy, then the total energy of a system plus its surroundings is….

The device of associating mechanical properties with the fields, which up to this point had appeared merely as convenient mathematical constructions, has even greater implications when conservation of energy is considered.

Energy conservation articles conservation law, which is regarded as basic to physics, seems…. Energy is conserved in projectile motion.

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Conservation of energy - Simple English Wikipedia, the free encyclopedia


energy conservation articles


Energy Conservation. Farmers and ranchers can cut input costs, maintain production, protect soil and water resources, reduce the nation’s dependence on fossil fuels, and save money by using the conservation practices described in the articles below. Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives. Energy efficiency is using technology that requires less energy to perform the same function. Using a light-emitting diode (LED) light bulb or a compact fluorescent light (CFL) bulb that requires less energy than an incandescent light bulb to produce the same amount of light is an example of energy efficiency. Energy conservation is any.