Help a girl with her electricity please?

[NorthernRaider]

IIRC AC current is the choice of the power companies primarily because it doesnt lose so much energy in long transmission lines. But DC is more efficient overall but its loses to much energy after a few hundred meters and switches for DC have to be different to AC ones as DC power can weld ordinary switches open or closed. The guys who originally started generating power way back when soon realised that though DC was the better system they would have to put a power plant at the end of each street just to deal with the drop.

A household domestic DC system should be attainable fairly easiily.