In my household I have a lot of electrical devices with low voltage power supply (router, telephone, LED-lamp, radio etc.). Each device brings its own power supply. This often looks like this:
Wouldn't it be more practical, better-looking, and economical to power multiple devices from one supply? The problem is, they require different voltage (12V, 6V, 5V, 4V) and there seem to be too many standards for cables and plugs (except 5V which I would use (micro)-USB for. Cables and power strips for mains electricity are cheaply available but how do power and wire low voltage safely? What disadvantages exist?