What is Power transmission?
'''Power transmission''' is moving [[energy]] from where it is made to where it is used. [[Power (physics)|Power]] is defined formally as units of [[energy]] per unit [[time]]. In [[SI]] units: 1 [[watt]] = 1 [[joule]]/s = 1 [[newton (unit)|newton]] * metre/second (1W=1J/s=1N·m/s). == Electrical power == {{main|electric power transmission}} With widespread establishment of [[power grid]]s, power transmission has came to be associated most often with [[electric power transmission]]. == Mechanical power == {{main|transmission (mechanics)}} Electrical 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 [[driveshaft]]s providing [[rotary power]]. Drivebelts would provide power to individual machines on the shop floor. Mechanical power may be transmitted directly using a solid structure such as a [[driveshaft]]; [[Transmission (mechanics)|transmission]] gears can adjust the amount of [[torque]] or [[Force (physics)|force]] vs. [[speed]] in much the same way an electrical transformer adjusts [[voltage]] vs [[current (electricity)|current]]. ==Chemicals and fuels== [[Chemical energy]] is transmitted by moving [[fuel]]<nowiki/>s to generate power in distant places. [[Pipeline]]<nowiki/>s and other large [[infrastructure]] projects transport [[natural gas]], [[petroleum]] and [[petroleum product]]<nowiki/>s for use as fuel. [[Category:Energy]] {{sci-stub}}