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Svein

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The definition of electrical heat in a resistor is [itex]E=\int R\cdot I^{2}dt[/itex]. We want this expression to be the same for DC and AC. Since the AC waveform repeats itself after the period T, we want [itex]E=\int_{0}^{T} R\cdot I_{dc}^{2}dt=\int_{0}^{T}R\cdot I_{ac}^{2}dt [/itex]. Since R and I

So - the equivalent DC current of an AC current is the square

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