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USB peripherals do not "Draw" current. - "A common misconception by beginners seems to be that a power supply will force its rated current through the load - this is incorrect, only as much current as the load will accept will flow" In other words a USB Serial Controller does not draw out Voltage at an amplitude on demand, it constantly flows 5volts of power which peripherals can accept, the heavier the load the less there is for everything else, but it wont burn out it will just stop working until things are removed. Sending a return voltage or a short circuit can fry a USB serial controller.
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