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Assuming your using a USB port to power your device, the answer is 2.5 Watts. A maximum of 500mA at 5V can be drawn from a Usb port. Power = Current * Voltage, which is 2.5 Watts by 0.5 Amps giving you a power output of 2.5 Watts

http://en.wikipedia.org/wiki/USB#Power

http://en.wikipedia.org/wiki/Power_(physics)#Average_electrical_power_for_AC

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15y ago

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