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The device is powered by 5v micro USB. Exactly how much current (mA) the Raspberry Pi requires is dependent on what you hook up to it. We have found that purchasing a 1.2A (1200mA) power supply from a reputable retailer will provide you with ample power to run your Raspberry Pi for most applications, though you may want to get a 2.5A (2500mA) if you want to use all 4 USB ports on the Models B+/2B without using an external powered USB hub.
Typically, the model B uses between 700-1000mA depending on what peripherals are connected, the Model B+ has slightly more efficient power circuits as well as more available USB ports and can use between 600-2000mA, and the model A can use as little as 500mA with no peripherals attached. The maximum power the Raspberry Pi Model A and B can use is 1 Amp, so if you need to connect a USB device that will take the power requirements of the Raspberry Pi above 1 Amp then you must connect it to an externally powered USB hub. Alternatively, the maximum power the Model B+ can use is 2 Amps before needing to connect devices to an externally powered USB hub.
The power requirements of the Raspberry Pi increase as you make use of the various interfaces on the Raspberry Pi. The GPIO pins can draw 50mA safely (that is 50mA distributed across all the pins! An individual GPIO pin can only safely draw 16mA), the HDMI port uses 50mA, the camera module requires 250mA, and keyboards and mice can take as little as 100mA or as much as 1000mA! Check the power rating of the devices you plan to connect to the Pi and purchase a power supply accordingly. If you’re not sure, we would advise you to buy a powered hub.
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