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Originally Posted by jdpman
Not to be too much of a devil's advocate but to continue on boredandtattooed's point...
How exactly does it not work like a light socket? I understand what you're saying that power could be sent to the USB because it thinks something is plugged in... but ultimately doesn't something need to be bridging the circuit for the power to be used? Isn't that Electricity 101? How does the electricity just magically disappear if it isn't actually being used?
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Because even if something isn't sucking down the power, the availability of that power itself means that power is getting used. For instance, your wall charger for your cell phone actually uses power, even when your phone isn't charging off of it (often termed "phantom power"). If the Rhodium is making 5v available, that means by electricity's very nature it's consuming some extra battery. Exactly how much that would be, I have no idea.