question_answer 46)

    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. 4(EP).31.                                     (a) Which curve shows power consumption over a full cycle?                           (b) What is the average power consumption over a cycle? (c) Identify the device 'X'.  

Answer:

                      A study of given curves in Fig. 4(EP).31 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 from curve A. (c) The device X may be an inductor (L) or a capacitor (C) or their combination (LC).