For the majority of RaspberryPi users, powering their Pi from a standard 5 Volt USB supply is the best and safest option.
The power supply is of fundamental importance, and if this does not do its job properly, your Pi powered project may be unreliable, or simply not run at all.
Most of the time, almost any 5 Volt USB power supply will be OK to power the Raspberry Pi when running with just mouse, keyboard & display, providing it is powerful enough.
