On May 31, 11:40*am, Andy Dingley wrote:
On May 31, 11:22*am, "Gazz" wrote:

there's loads of forums full of people claiming the usb psu will cost you
anything from 5p to 10 quid a year to run as it's on all the time,

Some of my workshop wall-warts now live in the bottom of my tool
cupboard. This both keeps the sawdust off them and their waste heat
also stops condensation in the winter. I used to have a small resistor
in there as a heating element, but now the wall-warts do it for me.

not sure this is a good idea as their transformer's power factor is
not high.
If the supply co. charges for volt amps rather than true power a
reactive load is wasting amps for less heat !

rusty