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If an R = 3Ω resistor, a Xc = 1Ω capacitor, and an XL = 5Ω...

If an R = 3Ω resistor, a Xc = 1Ω capacitor, and an XL = 5Ω inductor are connected in series with a f = 50Hz, V = 100 volts source, what is the current delivered by the source in function of (t)?

The answer is I = 20cos(100π t - tan-1(4/3)rad)

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