Does the usb port in a power cube use electricity even when no device is connected?

I have a power cube ( link below). Lets say i am charging my laptop but no wire is connected to the usb port in the power cube. So does the usb port consume... show more I have a power cube ( link below).
Lets say i am charging my laptop but no wire is connected to the usb port in the power cube. So does the usb port consume electricity?


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