Again, we are now arguing terminology.

If you consider _instantaneous_ power, then you have _watts_ flowing into the capacitor for 1/4 cycle, and then _watts_ flowing out of the capacitor for 1/4 cycle. Considering _instantaneous_ measurements watts and volt amperes are _equivalent_.

It is only when you are looking at time average measurements, averaged over entire half cycles, that it is meaningful to consider W and VA as different things. But now we are talking about the terms W and VA.

For time averaged measurements in ac systems, W describes (real) energy delivered to a load over time and VA describes (real) energy shuttling back and forth between source and load, with no net energy delivered. The energy shuttling between generator and capacitor is _real_ energy that could really do work, but instead gets swapped between the two components.

-Jon

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