An average home in the Western World has more than 40 power supplies for electronic devices from phone chargers to LCD TVs (internal or external). Power supplies transform AC current to DC, usually 5-12V. We can easily produce power supplies that can serve multiple devices in a single box - we already do that in personal computers. All the electronics industry have to do is remove the power supplies from their devices and give us standardised plugs to plug into the standardized sockets of...