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A device X' is connectedofto an ac source V - Vg sin cot. The variationin one cycle is shown in the following graphac source02π(a) Identify the device 'X.Which of the curves A, B and C represent the voltage, current andthe power consumed in the circuit ? Justify your answer.(b)How does its impedance vary with frequency of the ac source ?Show graphically.(c)(d) Obtainan expression for the current in the circuit and its phaserelation with ac voltage.

Answer»

The device X is a capacitorCurve A: Power consumed in the circuitCurve B: VoltageCurve C: Current (because current leads the voltage in capacitive circuit



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