A device 'X' is connected to an a.c. source. The variation of voltage, current and power in one complete cycle is shown in Fig. (a) Which curve shows power consumption over a full cycle? (b) What is the average power consuption over a cycle ? (c) Identify the device 'X'.

A device 'X' is connected to an a.c. source. The variation of voltage,

1.	A device 'X' is connected to an a.c. source. The variation of voltage, current and power in one complete cycle is shown in Fig. (a) Which curve shows power consumption over a full cycle? (b) What is the average power consuption over a cycle ? (c) Identify the device 'X'.
Answer» Solution :A study of given curves in Fig. reveals that (a) power CONSUMPTION over a FULL cycle is represented by CURVE A. (b) Average power consumption over a full cycle = Zero , as is clear form curve A. (c ) The device X may be an inductor (L) or a capacitor (C )or their COMBINATION (LC)

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A device 'X' is connected to an a.c. source. The variation of voltage, current and power in one complete cycle is shown in Fig. (a) Which curve shows power consumption over a full cycle? (b) What is the average power consuption over a cycle ? (c) Identify the device 'X'.

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