First slide
Wattless current

A small signal voltage V(t)=V0 sin ωt  is applied across an ideal capacitor C


(4): When an ideal capacitor is connected with an ac voltage source, current leads voltage by 900 . Since, energy stored in capacitor during charging is spent in maintaining charge on the capacitor during discharging. Hence over a full cycle the capacitor does not consume any energy from the voltage source.

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