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If those are switch-mode power supplies most of the that current will be drawn out of phase (ie. imaginary power); not important to the domestic customer, as the meter probably won't read it, but important to the supplier, who will come and make you fit power correction equipment to your supply :-)

My beaglebone consumes about 1.7W so that sounds about right.

One interesting thing is that the USB port being activated (even idle) can blow any power consumption by the CPU itself out of the water.

How do you get 120W? I get 24W.

0.37amps X 5volts X 64

Oh, I'm an idiot. Misread it as 370mW.