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AC power from the utility is converted to [[Direct current|DC]], then back to AC using [[insulated-gate bipolar transistor]]s (IGBTs).<ref>"[http://www.phas ...IGBTs that draw on the power previously stored in the DC bus to create an AC voltage that is not sinusoidal. It is a [[Pulse-width modulation|pulse-wid ...

...beginning of the 20th century, there were two main principles of electric railway [[traction current]] systems: ...ingle-phase motors; the latter not being available in sizes over {{convert|15|hp|abbr=on}} and, though available, rarely seen larger than {{convert|5|hp| ...

...ch as single-phase [[traction power network|traction power]] for [[railway electrification system]]s.<ref>{{cite web|title=Hydropower Sustainability Assessment Tool|u ...rotations per second to match the desired frequency (in [[hertz]]) of the AC output. ...

{{Short description|Railway line in Norway}} |type = Railway ...

...the nominal [[frequency]] of the oscillations of [[alternating current]] (AC) in a [[wide area synchronous grid]] transmitted from a [[power station]] t Several factors influence the choice of frequency in an AC system.<ref name=LAMME18>B. G. Lamme, ''The Technical Story of the Frequenc ...

...world. Specialized power systems that do not always rely upon three-phase AC power are found in aircraft, electric rail systems, ocean liners, submarine ...he transformer was used to light up {{Convert|40|km|mi|abbr=off|sp=us}} of railway from a single [[alternating current]] generator.<ref>{{cite web | url=http: ...

[[File:500kV 3-Phase Transmission Lines.png|thumb|Five-hundred kilovolt (500 kV) [[Three-phase electric power]] Transmission Lines at [[Grand Coulee Dam]]. ...current|currents]]. Transmission lines use either [[alternating current]] (AC) or [[direct current]] (DC). The voltage level is changed with [[transforme ...

...508-8|s2cid=32935308}}</ref>) is a common type of [[alternating current]] (AC) used in [[electricity generation]], [[Electric power transmission|transmis ...es [[phase shift]]ed relative to each of the other wires. Because it is an AC system, it allows the voltages to be easily stepped up using [[transformer] ...

...sions, fans and electric lamps into a [[wall socket]]. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', ...sound (audio) or images (video) sometimes carried by [[modulation]] of an AC carrier signal. These currents typically alternate at higher frequencies th ...

...distance. At the consumer ends the [[thyratron]] converts the DC into the AC.<ref>{{Cite book|title=HVDC power transmission systems : technology and sys ...ation system]]s. Electricity is transmitted at [[high voltage]]s (115&nbsp;kV or above) to reduce the energy loss which occurs in long-distance transmiss ...

Transformers are used to change [[Alternating current|AC]] voltage levels, such transformers being termed step-up or step-down type ...New York|pages=[https://archive.org/details/electronicradioe00term/page/15 15]}}</ref> A [[saturable reactor]] exploits saturation of the core to control ...