What is there a difference in house current( 110V ) and
many electronic devices rated for 120V( usually computer hardware ), and
large voltage ranges( between 100V and 240V ) on electronic devices?
110V is not current, it is EMF - electromotive force - how hard the electrons
are being pushed. Current is measured in amperes.
More specifically, 110V is not significantly different from 120V... some ask
for 115. The power company adjusts the voltage and it may vary slightly from
place to place (at least within the US). Where I live the power company sets
the voltage at 117 volts.
240 volts is very different, but you may consider anything from 110 to 120 as
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Update: June 2012