I did in fact mean 1250, not 12500, but I was talking about watts. No
>lightbulb, appliance, or computer PSU has ever been rated in VA. (This
>is odd to me, since from what I've read it's VA that applies to AC. Why
>are these things rated in watts?)
Because that's what you pay the power company for.
If the load is a resistor, watts = V*A
But consider a capicator or inductor. It takes current, but it gives it back on the other half cycle. No net power.
I'm looking at using the relay-switched strip with a few combinations of
>small items. For example, a pair of wall transformers marked 25W and a
>toy lamp rated 17W. What's my current per watt at 125VAC?
Light bulbs have a horrible (10x) starting current when they are cold. That's nasty to relays.
I'd add up all the power, divide by 125, round up generously, then look in the catalogs and probably round up some more.