Given that a nonzero AC voltage source is applied, what can you sayabout whether

Question

Given that a nonzero AC voltage source is applied, what can you sayabout whether the power, reactive and complex power are positive,negative, or zero for: A) a pure capacitor in series with a pure inductor. B) a capacitor in parallel with an inductor. C) an inductor in series with a resistor.
Consider all cases and justify your answer.


A) a pure capacitor in series with a pure inductor. B) a capacitor in parallel with an inductor. C) an inductor in series with a resistor.
Consider all cases and justify your answer.

Explanation / Answer

case 1) for a capacitor in series with an inductor assume thecurrent i at an angle . for the capacitor P=-Vc2wC=positive ornegative as Vc can be imaginary for inductor P= Lidi/dt = depends on rate of change ofcurrent
case 2) for the capacitor P=-Vc2wC =positive ornegative as Vc can be imaginary for inductor P= Lidi/dt = depends on rate of change ofcurrent

case 3) for resistor P=I2R=always positive for inductor P=LIdi/dt=depends on rate of change ofcurrent

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