Linked by Thom Holwerda on Wed 22nd Feb 2012 14:44 UTC

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Member since:
2005-07-06
It's a pretty safe bet one wire will be connected frequently - the one supplying power.
(so it might as well double for some large transfers; and yes, there's inductive energy transfer... but a) waste b) tying the device in one spot anyway, hence making "a" even harder to justify for most people)