It's really going to depend on the appliance. Something like a toaster would sorta work, depending on power levels. Even some motors might - I've read this, anyway, but haven't tried it. Things with transformers won't. But the odd thing is that a lot of the transformers, particularly the "wall wart" sort, are converting the household 120 volt AC to DC, usually at 9 or 12 volts, so with the right plug (and maybe a resistor) you can run them directly on 12V DC.
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