After a great deal of speculation the 5V Micro USB Jack has been confirmed to supply power to the Raspberry Pi board. Eben states this was for two reasons:
- "Ubiquity. Micro USB has been chosen as the GSMA’s Universal Charging Solution, so we expect AC adapters with this connector to be cheap and plentiful.
- Voltage assurance. Unlike coaxial jacks, we know that we’ll be receiving 5V over this connector, which we can pass on unregulated to HDMI and USB devices.
Model B owners using networking and high-current USB peripherals will require a supply which can source 700mA (many phone chargers meet this requirement). Model A owners with powered USB devices will be able to get away with a much lower current capacity (300mA feels like a reasonable safety margin)."
For those wondering what a 5V micro USB power supply looks like grab the nearest mobile phone and it will most likely utilise the same technology. If your still flummoxed, here's a picture.