"William Sommerwerck" writes:

Your electric meter measures watts, not VA. If you know the power
factor, you can convert these VA measurements to watts and eventually
to your cost of electricity. The kill-a-watt meter shows both VA and
watts (as well as PF).

My understanding was that the watt-hour meter actually measure VA-hours. I
asked the electric company once, and that said that was the case. But I
wasn't speaking with an engineer.

It measures true watt-hours. A bad PF device will cost you only SLIGHTLY
more in losses than if it had 1.0 PF. [Increased I, ergo more I^2R]

You can look up "Electricity meter" in Wikipedia..
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