The basic formulas for RMS voltage, current, power, etc. in a simple single-phase circuit are well-defined and universal. For polyphase systems, the situation is more complex: in the 3-phase delta there are hidden variables that prevent an exact calculation of some values.
For these there are different methods which make different assumptions about the system. Here, two different methods for computing apparent power and power factor are given – the arithmetic and vector methods, along with suggestions on which to use.
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