Answer Posted / meenakshi

There isn't really any electrical principle for that.
Originally Commercial Electric distribution was first done
by Edison and his Manhattan DC lighting system was opened
in September,1882.Edison took 100V as the voltage for his
incandescent lamps.( Why 100 V?Round number,safe electrical
voltgae to handle,but high enough to save copper in
conductors)But it soon became clear that at the fag end of
street the lamps were not burning well due to voltgae drop
in line.Edison had to raise the generator voltage to 110 V
( there by distribution voltage became 110V!)to take care
of the voltgae drop in line.thus it became a std in US.

N PPL, THERE IS NOTHING TO DO WITH FORM FACTOR AS U THINK.

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