Following should be correct for AC:
Voltage and Current are Bound together in the same Sinus Curve. Up and down together.
One complete Circle would be 360° but an Inductor (Motor) would shift the Current 90° after the Voltage. This brings some loss in energy.
To counter that effect you can use Capacitors which shift the Current 90° before the Voltage.
Depending on the Use Case (Motor) both will be used to Offset each other and increase efficiency.
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