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Calculate the active power in a 543 F capacitor.(a) 581 W(b) 897 W(c) 0 W(d) 892 WThis question was addressed to me during a job interview.This key question is from Methods to Reduce the Energy Loss During Starting in section Starting of Electric Drives

Answer»

Correct option is (C) 0 W

The BEST I can explain: The capacitor is a linear element. It only absorbs reactive power and stores it in the form of OSCILLATING ENERGY. The voltage and current are 90° in PHASE in case of the capacitor so the angle between V & I is 90°. P=VIcos90°= 0 W. Current leads the voltage in case of the capacitor.



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