[QUOTE=Crafter_Man]
I don’t know; perhaps a small amount.
[/QUOTE]
Oh, they definitely do–at least the wall warts with a transformer inside. It’s called the no-load magnetizing (or excitation) current, and it’s due to various iron losses. Your typical small wall wart with a laminated silicon steel core will have an I[sub]x[/sub] of a few tens of milliamps.