I am looking forward to buying Raspberry Pi 3 from Amazon. I want to test Windows 10 IoT. I am wondering what kind of cable do I need to connect it to power. How much energy does it need? Should it be something like a laptop cable with a transformer? Thanks
Normally the Raspberry comes with a 5V / 3A power supply. The value of 5V is standard (can vary up to 5.20V) nothing more. The current can be up to 2.5A. I use a usb cable anyway.
Officially the rating is 5V-3A. But Raspberry Pi works very well with a 5V-2.5A adapter. If you have a 2.5 ampere mobile charger you can use that too. But never use a fast-charger. If you want to use all the ports in Pi then you should use a 5V-3A charger. I have a guess that you want to use a voltage regulator as well. It will work, but you have to be extremely careful about that.