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Oct 10, 2013 at 16:18 vote accept Jez
Oct 9, 2013 at 15:23 comment added RedGrittyBrick @Henry: Universal Motors are fairly common and are used in at least some hand-held drills - so the need for a step-down transformer (or equivalent) may be the more compelling reason.
Oct 8, 2013 at 23:45 comment added Hank I think the AC/DC difference is probably more significant than the voltage. AC power is well-suited to motors, but batteries are DC.
Oct 8, 2013 at 21:00 history answered bib CC BY-SA 3.0