I connected a resistive load, the current wave on a power analyzer was pure sinusoidal and in-phase to the voltage. When connected an inductive load instead, the current wave was still pure sinusoidal and delayed by an angle. But when replaced the inductive by a capacitor, or connected both the inductive load and the capacitor, or connect all three (resistive, inductive, and the capacitor), the wave becomes no longer sinusoidal.