The Pi was originally intended to run off of a micro USB phone charger ... you’re going to need a beefy power supply. Increasing the current limiting of the USB ports to 2A will require ...

[Paul] recently purchased an inexpensive USB power pack ... a few resistors he discovered that a 22 ohm one will keep the power supply on indefinitely. If there’s no load, it only remains ...

The power supply requirements differ by Raspberry Pi model. All models require a 5.1V supply, but the current required generally increases according to model. All models up to the Raspberry Pi 3 ...