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Computers → Computer hardware → Power issues
ANSWERS: 1
  • Official Know-It-All
    Most powered USB hubs will work somewhat when not plugged into a power source, but not for devices that require power. So a powered hub not plugged in will work with devices such as keyboards or printers but not iPods or cameras. The hub will also generally not charge batteries if not plugged in.

    Source:

    WiseGeek.com: What is a USB Hub?

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