Charge my iPod when iMac is off?

I've heard that one can charge the iPod or iPhone when the computer is off. But I would have though that apple as the iPod manufacturer would integrate this feature into their computers. But it apparently can't. Did I miss something or is it the truth that can't be changed?
I'm using white intel iMac 20"

Boy of Wonder wrote:
I've heard that one can charge the iPod or iPhone when the computer is off.
But it apparently can't. Did I miss something or is it the truth that can't be changed?
I heard that also -- but I checked it with a bus-powered audio interface,
and "Shut Down" definitely turns the USB power OFF (on all USB ports).
...however, USB power does remain ON during "Sleep"
Looby

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