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Download the Quiz
Download the Quiz

... C. 120 volts D. 300 volts T0A02 (D) How does current flowing through the body cause a health hazard? A. By heating tissue B. It disrupts the electrical functions of cells C. It causes involuntary muscle contractions D. All of these choices are correct T0A03 (C) What is connected to the green wire in ...
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Three-phase electric power



Three-phase electric power is a common method of alternating-current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. It is also used to power large motors and other heavy loads. A three-phase system is usually more economical than an equivalent single-phase or two-phase system at the same line to ground voltage because it uses less conductor material to transmit electrical power.The three-phase system was independently invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky, Jonas Wenström and Nikola Tesla in the late 1880s.
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