"Weatherlawyer" writes:

Chargers do get warm if left plugged in but I find it hard to believe
this would amount to a tenth of a kilowatt in a day.

5W. Certainly modern chargers are quite cool so I agree with you.

When I suffered a disk crash a few weeks ago I borrowed a USB-IDE
adaptor and the nasty hot power supply with that took 7W with nothing
connected.

Jon