Meta-theory of electric powers and present state of power theory of circuits with periodic voltages and currents

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Historically justified goals of the power theories development, general expectations and mathematical tools used for it are discussed in the paper. General features of the power theory of single-phase circuits with sinusoidal voltages and currents, the only commonly accepted power theory, were used as a reference for the presented discussion. Also discussed in this paper are the major issues of power theories development such as these: Should the power theory be formulated in the frequency or in time-domain? Should it be based on quantities averaged over a period or on instantaneous values? It was shown that in spite of the name "power" theory, the load currents rather than powers convey information on power properties of electrical circuits.

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Przeglad Elektrotechniczny

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