Right, most of Europe is 240 v, 50 cycle.
What is amazing is that most adapter/wall warts for laptops, camera battery chargers and so forth, are auto-detect. That is, they sense if the line voltage is 120v/60 hz or 240 v/50 hz. No switching needed.
But yes, there could easily be weird or dirty power in areas outside of large cities.
I suppose what would be ideal is a rechargable device that plugs into line voltage and allows
USB port charging of devices. Perhaps using C-cells, perhaps not. I’ll have to search around I guess.
I would imagine the new Boeing 787 and Airbus A380 super jets (if they ever get off the production line) will have 12v power at the seats, for laptops.
But maybe not. Probably value-engineer that subsytem out before full production. I’d imagine 450 laptops could really add to the electrical load.
Boeing 787 Dreamliner specs:
- Four at 250 kVA (two per engine)
- Two at 225 kVA (on auxiliary power unit)
[250 kW is a lot of juice but a 300 laptops pulling 50-100 W each is around 2kW. Maybe one percent of the capacity. Seems feasible]
12 volt requires big cable. big cable = big weight. That would probably be more of factor than the actual loads.
Anyway, clearly I digress.