PAL and NTSC are TV formats ...
I think you wanted to point out the difference in frequency ... 50Hz and 60Hz ... which is also present in PAL/NTSC but still, those have nothing to do with electricity or sockets

No, I'm talking about electricity, but yes, I did reference TV formats on accident. But what I meant was Euros use 220v and in the States it's 110v standard and often converters can be necessary depending on the device.