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Assuming that this question is about adapters for traveling to another country (not USA) then 230V is the equivalent of 220V. Just purchase a suitable adapter.
No! Normally not, the recistance in the windings is to hig on 60Hz and the pump motor has not power enough to work propelly. This happened to myself when I connected my Whirpool AWE 7519 to 230V 60Hz. Europian model for 50Hz.
no way because frequency cannot change
you can't
Yes, no problem.
230V/50Hz
220v 50Hz
Most likely, yes. Most devices has been manufactured with an idea that they will be used in areas where the supply power frequency is 50 or 60Hz.
nothing
There should be no problem at all.
220V , 50Hz
an adapter is needed because the 50 or 60 refers to cycles or how many times elec. changes direction a second . an adapter is needed to change from 50 to 60 or vice versa 60 cycle is used in usa and 50 cycle is used in Europe