A device 'X' is connected to an ac source V The variation of voltage, current and power in one cycle is shown in the following graph:
(a) Identify the device 'X'
(b) Which of the curves A,B and C represent the voltage, current and the power consumed in the circuit? Justify your answer.
(c) How does its impendance vary with frequency of the ac source ?
(d) Obtain an expression for the current in the circuit and its phase relation with ac voltage.