Power is multiplication of voltage and current. You need to know the load current drawing to establish the power. It is a bad idea to use 230 v adapter in 120 volts outlet
The power adapter need 230v, 50Hz supply
Yes.
No, different voltages, we have 230v supply, US 120v. There would be a big bang and lots of smoke, I did it at work once!
Absolutely not. In the U.S. all power is 120v on a single line (one hot, one neutral, one ground) overseas all power is 230v on a single line. Will fry your unit. You can however by a step down or up transformer fairly cheaply at radio shack.
I imagine it depends where you live... 120v in USA, and 230v in UK & spain.
Yes, if you have the appropriate adapter
Yes, it can be and there is no problem at all Because most of the electrical appliances are made to work on 220v - 240v so it can also be plugged into a 240v outlet.
Actually, electrical current in Poland is 230V.
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.
You would have to install a 230 volt outlet.
Pretty certainly no; it depends slightly on the type of adaptor - if it's regulated then you'll probably destroy the adaptor and maybe the device it's plugged unto, if it's unregulated then you'll probably destroy the device and maybe the adaptor.
Anything of such voltage will be burnt if plugged in a 230v socket outlet because the voltage is too high.