What is phase ac?

Some articles on phase, phase ac, phases, ac:

Multiple Overhead Lines
... that used two or three overhead lines, usually to carry three-phase current to the trains ... Nowadays, three-phase AC current is used only on the Gornergrat Railway and Jungfraujoch Railway in Switzerland, the Petit train de la Rhune in France, and the Corcovado Rack Railway in Brazil until 1976, it ... On these railways, the two conductors of the overhead lines are used for two different phases of the three-phase AC, while the rail was used for the third phase ...
Electric Rail Transport - History - Introduction of Alternating Current
... The first practical AC electric locomotive was designed by Charles Brown, then working for Oerlikon, Zürich ... In 1891, Brown had demonstrated long-distance power transmission, using three-phase AC, between a hydro-electric plant at Lauffen am Neckar and Frankfurt am Main West railway station, a distance of 280 km ... on steam-electric locomotive designs, had observed that three-phase motors had a higher power-to-weight ratio than DC motors and, because of the absence of a ...
25 K V 50 Hz - History
... He used 16 kV AC at 50 Hz, asynchronous traction, and an adjustable number of (motor) poles ... related to the requirement to use DC series motors, which required the current to be converted from AC to DC and for that a rectifier is needed ... It was possible to use AC motors (and some railways did, with varying success), but they did not have an ideal characteristic for traction purposes ...
AC Motor - History
... Because AC's advantages in long distance high voltage transmission there were many inventors in the United States and Europe during the late 19th century trying to ... identified the rotating magnetic field principle and that of a two-phase AC system of currents to produce it ... was “furnished by the machine itself.” In 1886, English engineer Elihu Thomson built an AC motor by expanding upon the induction-repulsion principle and his wattmeter ...

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