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Which advantage is there when the device in USB mode isn‘t bus powered by the computer?

April 26, 2017advantage bus Computer device mode powered USB

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Which advantage is there when the device in USB mode isn‘t bus powered by the computer?

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Only a USB bus is able to provide his connected devices (max. 127) with max. 500 mA power supply in common. If the power consumption of the connected USB devices is nearly 500 mA, every additional USB device on the bus will overcharge it.