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[Phys-L] USB charger outlets

We all know about the losses caused by leaving wall warts plugged in when not in use (and TVs, etc.), but do these outlets have the same issue?

There are several different types. This one references built-in electronics to sense this and that, which presumably requires some power. Does anybody know the comparison? Along the same lines - does my new phone charger (small block, usb connection to mini usb) have the same issues as the old ones? There doesn't seem to be enough room for a large transformer in there. I don't know if they're smaller or if it's a new technology.


Joshua Gates
Physics Faculty
Tatnall School (Wilmington DE)
JHU Center for Talented Youth