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Since the development of technology, power transmission and storage systems have been of immense interest to technologists and technology users. 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).
Transmission is relocating energy from its place of origin to a location where it is applied to performing useful work.
1 Electrical power
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 transformerThe word Transformer can also mean: The Transformers toys, and the related comics and animated television series which have run from the 1980s onwards. A glam rock album by Lou Reed, named Transformer . Transformers ''Typical electrical configurations See in order to minimise resistiveElectrical resistance is a measure of the degree to which an electrical component opposes the passage of current. It is the ratio of the potential difference (i. voltage) across an electric component (such as a resistor) to the current passing through it: lossLoss 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. Calculation and units used are the same as with Gain, except that the output is in the conductorsIn science and engineering, conductors are materials that contain movable charges of electricity. When an electric potential difference is impressed across separate points on a conductor, an electric current between those points appears in accordance with 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.
Power may also be transmitted by changing electromagnetic fieldThe electromagnetic field EMF is composed of two related vectorial fields, the electric field and the magnetic field. This means that the vectors E and B that characterize the field each have a value defined at each point of space and time. If only E thes or by radio waves; microwaveThis page is about the radiation; for the appliance, see microwave oven. Microwaves are electromagnetic waves with a wavelength longer than infrared light, but shorter than radio waves. Microwaves, also known as Super High Frequency (SHF signals, have wav energy may be carried efficiently over short distances by a waveguide.
2 Mechanical power
Mechanical power may be transmitted directly using a solid stucture 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.
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.
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.
