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  • Utility frequency — The waveform of 230 volt, 50 Hz compared with 110 V, 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the frequency at which alternating current (ac, also AC) is transmitted from a… …   Wikipedia

  • Telegraphy — (from the Greek words (τηλε) = far and (γραφειν) = write) is the long distance transmission of written messages without physical transport of letters. Radiotelegraphy or wireless telegraphy transmits messages using radio. Telegraphy includes… …   Wikipedia

  • electric generator — ▪ instrument Introduction also called  dynamo,         any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the… …   Universalium

  • Electrical telegraph — A printing electrical telegraph receiver, and a transmitter key at bottom right An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. The electromagnetic telegraph is a device… …   Wikipedia

  • List of Edison patents — Below is a list of Edison patents. Thomas Edison was an inventor who, it is said, accumulated 1500 plus patents worldwide for his inventions. Nearly 1100 of Edison s patents were in the United States, but other patents were approved in countries… …   Wikipedia

  • Electricity meter — Typical North American domestic analog electricity meter …   Wikipedia

  • List of mathematics articles (C) — NOTOC C C closed subgroup C minimal theory C normal subgroup C number C semiring C space C symmetry C* algebra C0 semigroup CA group Cabal (set theory) Cabibbo Kobayashi Maskawa matrix Cabinet projection Cable knot Cabri Geometry Cabtaxi number… …   Wikipedia

  • Rotary converter — A rotary converter is a type of electrical machine used to convert one form of electrical power into another form. There are several types:* Rotary Phase Converter (RPC) for converting single phase power to three phase power. See Rotary phase… …   Wikipedia

  • British absolute block signalling — The principle of the British absolute block system of railway signalling is to facilitate the safe operation of a railway by preventing more than one train from occupying a defined section of route at the same time. This system is used on double… …   Wikipedia

  • Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …   Wikipedia

  • Serial communication — In telecommunication and computer science, serial communication is the process of sending data one bit at one time, sequentially, over a communication channel or computer bus. This is in contrast to parallel communication, where several bits are… …   Wikipedia

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