you have to make a difference between video and electricity standards. using an ntsc-dc in europe isn't a prob, because all newer pal-tvs support several ntsc video standards. hooking it up is another question, because in the usa you use 110V/60Hz, while european electricity lines use 220V/50Hz. you'd need a voltage transformer to use the dc, unless it comes with a 110/220V compatible ac-adaptor. many modern devices support both voltages, but since game consoles are supposed to stay in their specific region for the effectiveness of region protection, they most likely won't support that.
as for the video standards:
pal is defined with 50Hz, ntsc with 60hz. this is the result of the video coding scheme they use. ntsc is an ancient black and white standard and if you'd be correct about it, then all you get are 59,94 frames per second (hence ntsc dvds playing at 59,94/2=29,97). when color tv arrived, ntsc had to be tweaked to also transmit the color, which is done with the remaining 0,06fps. pal on the other side is much newer and therefor supports color coding natively. so it was later quite easy to develop the pal60 standard, which uses 60Hz but still depends on the pal color coding scheme. the point of 50hz is to display all 25-framed content. analogue and digital tv still transmit either 25 full frames or 50 half frames per second. while a console can deliver 10fps more content easily, you'd have to upscale normal video input to 60hz. that would require extra hardware and wouldn't bring any benefit, because the source it would use would still be 50hz. the only thing you'd get with that would be duplicate frames.
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