The power system that runs the world. Three sinusoids 120 degrees apart deliver constant power and self-starting motors — see the waveforms, phasors, and the power triangle.
Three-Phase PowerLive
the grid's backbone
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Three-phase power delivers energy on three conductors carrying sinusoids 120° apart, so total power is constant and motors self-start. Line and phase voltages differ by √3, and real power is P = √3·V_line·I·cosφ. The power factor cosφ measures how much current actually does useful work.
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How it works
Three-phase power distributes energy on three conductors carrying voltages 120° apart, so instantaneous total power stays constant. Line and phase voltages differ by a factor of √3, and real power is P = √3·V_line·I·cosφ. The power factor cosφ sets how much of the apparent power does useful work — the basis of grid and industrial electrical engineering.
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