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Encyclopedia > Power transmission

Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work. Look up work in Wiktionary, the free dictionary. ...


Power is defined formally as units of energy per unit time. In SI units: 1 watt = 1 joule/s = 1 newton * metre/second (1W=1J/s=1N·m/s). // Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. ... A watch Attempting to understand time has long been a prime occupation for philosophers, scientists and artists. ... The International System of Units (abbreviated SI from the French language name Système International dUnités) is the modern form of the metric system. ... The watt (symbol: W) is the SI derived unit of power. ... The joule (symbol: J) is the SI unit of energy, or work. ... The newton (symbol: N) is the SI unit of force. ...


Since the development of technology, Transmission and storage systems have been of immense interest to technologists and technology users. To meet Wikipedias quality standards, this article or section may require cleanup. ... In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... Storage is the at least semi-permanent holding of an amount of something. ... A system is an assemblage of inter-related elements comprising a unified whole. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Contents


Electrical power

Main article: electric power transmission

With widespread establishment of power grids, power transmission has come to be associated most often with electric power transmission. Alternating current is normally preferred as its voltage may be easily stepped up by a transformer in order to minimise resistive loss in the conductors used to transmit power over great distances; another set of transformers is required to step it back down to safer or more usable voltage levels at destination. Transmission lines in Lund, Sweden Electric power transmission is one process in the delivery of electricity to consumers. ... Transmission towers Transmission lines in Lund, Sweden Electric power transmission, or more accurately Electrical energy transmission, is the second process in the delivery of electricity to consumers. ... Transmission lines in Lund, Sweden Electric power transmission is one process in the delivery of electricity to consumers. ... city lights viewed in a motion blurred exposure. ... Three-phase pole-mounted step-down transformer A transformer is an electrical device that transfers energy from one circuit to another purely by magnetic coupling. ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... Loss has several meanings including: Loss in electronics is the ratio of the system output to system input In electronics, loss is the ratio of system output to system input. ... In science and engineering, conductors are materials that contain movable charges of electricity. ...


Power may also be transmitted by changing electromagnetic fields or by radio waves; microwave energy may be carried efficiently over short distances by a waveguide. To meet Wikipedias quality standards, this article or section may require cleanup. ... Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. ... This page is about the radiation; for the appliance, see microwave oven. ... To meet Wikipedias quality standards and appeal to a wider international audience, this article may require cleanup. ...


Mechanical power

Main article: transmission (mechanics)

Electronic power transmission has replaced mechanical power transmission in all but the very shortest distances. From the start of the industrial revolution until the end of the 19th century mechanical power transmission was the norm. Factories were fitted with overhead driveshafts providing rotary power. Drivebelts would provide power to individual machines on the shop floor. In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... The Industrial Revolution was the major technological, socioeconomic and cultural change in the late 18th and early 19th century resulting from the replacement of an economy based on manual labour to one dominated by industry and machine manufacture. ... Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... Cardan driveshaft with universal joints A driveshaft or driving shaft or Cardan shaft is a mechanical device for transferring power from the engine or motor to the point where useful work is applied. ...


Mechanical power may be transmitted directly using a solid structure such as a driveshaft; transmission gears can adjust the amount of torque or force vs. speed in much the same way an electrical transformer adjusts voltage vs current. Cardan driveshaft with universal joints A driveshaft or driving shaft or Cardan shaft is a mechanical device for transferring power from the engine or motor to the point where useful work is applied. ... In mechanics, a transmission or gearbox is the gear and/or hydraulic system that transmits mechanical power from a prime mover (which can be an engine or electric motor), to some form of useful output device. ... In physics, torque can be thought of informally as rotational force. Torque is commonly measured in units of newton metres; although, centiNewton Meters (cNm), Foot Pounds (Lb-Ft), Inch Pounds (Lb-In) and Inch Ounces (Oz-In) are also frequently used expressions of torque. ... In physics, a force is an external cause responsible for any change of a physical system. ... Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t. ... This article may be too technical for most readers to understand. ... In electricity, current refers to electric current, which is the flow of electric charge. ...


Hydraulic systems use liquid under pressure to transmit power; canals and hydroelectric power generation facilities harness natural water power to lift ships or generate electricity. Pumping water or pushing mass uphill with (windmill pumps) is one possible means of energy storage. Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks. ... Categories: Water-transport stubs | Canals | Water transport ... Hydroelectric dam diagram The waters of Llyn Stwlan, the upper reservoir of the Ffestiniog Pumped-Storage Scheme in north Wales, can just be glimpsed on the right. ... Itaipu Dam is a hydroelectric generating station Electricity generation is the first process in the delivery of electricity to consumers. ... For online phenomenon of shipping, see Shipping (fandom). ... Pitstone Windmill, believed to be the oldest windmill in the British Isles A modern day windmill as seen on the Rotar farm in California. ...


Pneumatic systems use gasses under pressure to transmit power; compressed air is commonly used to operate pneumatic tools in factories and repair garages. A pneumatic wrench (for instance) is used to remove and install automotive tyres far more quickly than could be done with standard manual hand tools. Pneumatics, from the Greek πνευματικός (pneumatikos, coming from the wind) is the use of pressurized air in science and technology. ... Pneumatics, from the Greek πνευματικός (pneumatikos, coming from the wind) is the use of pressurized gases to do work in science and technology. ... Pneumatics, from the Greek πνευματικός (pneumatikos, coming from the wind) is the use of pressurized air in science and technology. ... This page discusses common devices known as tools, for other meanings see Tool (disambiguation) Modern hammer A tool is, among other things, a device that provides a mechanical or mental advantage in accomplishing a task. ... A factory (previously manufactory) is a large industrial building where goods or products are manufactured. ... Repair and Maintenance is fixing any sort of mechanical or electrical device should it get out of order or broken (repair) as well as performing the routine actions which keep the device in working order (maintenance) or prevent trouble from arising (preventive maintenance). ... Look up garage in Wiktionary, the free dictionary. ...


A pneumatic system was proposed by proponents of Edison's direct current as the basis of the power grid. Compressed air generated at Niagara Falls would drive far away generators of DC power. The War of Currents ended with alternating current (AC) as the only means of long distance power transmission. Thomas Alva Edison (February 11, 1847 – October 18, 1931) , American, was an inventor and businessman who developed many devices which greatly influenced life in the 20th Century. ... Direct current (DC or continuous current) is the continuous flow of electricity through a conductor such as a wire from high to low potential. ... For other uses, see Niagara Falls (disambiguation). ... In the War of Currents era in the late 1880s, Nikola Tesla and Thomas Edison became adversaries due to Edisons promotion of direct current (DC) for electric power distribution over the more efficient alternating current (AC) advocated by Tesla. ... city lights viewed in a motion blurred exposure. ...


Chemicals and fuels

Power (and energy) may be transmitted by physically transporting chemical or nuclear fuels. Possible artificial fuels include radioactive isotopes, wood alcohol, grain alcohol, methane, synthetic gas, cryogenic gas, hydrogen gas (H2) and liquefied natural gas (LNG). A chemical substance is any material substance used in or obtained by a process in chemistry: A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions. ... The neutrality of this article is disputed. ... For the workstation, see SGI Fuel. ... A radionuclide is an atom with an unstable nucleus. ... Methanol, also known as methyl alcohol or wood alcohol, is a chemical compound with chemical formula CH3OH. It is the simplest alcohol, and is a light, volatile, colourless, flammable, poisonous liquid that is used as an antifreeze, solvent, fuel, and as a denaturant for ethyl alcohol. ... Ethyl alcohol, also known as ethanol or grain alcohol, is a flammable, colorless chemical compound, one of the alcohols that is most often found in alcoholic beverages. ... R-phrases S-phrases , , , Flash point −188 °C Autoignition temperature 537 °C Explosive limits 5–15% Supplementary data page Structure and properties Thermodynamic data Spectral data UV, IR, NMR, MS Related compounds Related alkanes Ethane Propane Related compounds Methanol Chloromethane Except where noted otherwise, data are given for materials in... Syngas (from synthesis gas) is the name given to gasses of varying composition that are generated in coal gasification and some types of waste-to-energy facilities. ... Cryogenics is the study of very low temperatures or the production of the same, and is often confused with cryobiology, the study of the effect of low temperatures on organisms, or the study of cryopreservation. ... A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... LNG receiving terminal Liquefied natural gas or LNG is natural gas that has been processed to remove impurities and heavy hydrocarbons and then condensed into a liquid at atmospheric pressure by cooling it to approximately -160 degrees Celsius. ...


See also


  Results from FactBites:
 
Electric power transmission - Wikipedia, the free encyclopedia (2487 words)
Typically power transmission is between the power plant and a substation in the vicinity of a populated area.
The separation of transmission and generation functions is one of the factors that contributed to the 2003 North America flout.
Transmission and distribution losses in the USA were estimated at 7.2% in 1995 [1], and in the UK at 7.4% in 1998.
Power transmission - Wikipedia, the free encyclopedia (495 words)
Power transmission is the movement of energy from its place of generation to a location where it is applied to performing useful work.
Power may also be transmitted by changing electromagnetic fields or by radio waves; microwave energy may be carried efficiently over short distances by a waveguide.
Mechanical power may be transmitted directly using a solid structure such as a driveshaft; transmission gears can adjust the amount of torque or force vs. speed in much the same way an electrical transformer adjusts voltage vs current.
  More results at FactBites »

 
 

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