Let me rephrase the questions:

1)  Will I need a converter in Nepal to use a PS3 purchased in US?  In other words, does PS3 have universal power supply (such as in laptops) where it won't be necessary to use a converter.

2)  Region code does matter.  If I buy US PS3, will I be able to play DVD that I bought in Nepal, because US and Nepal will have different region code, and since the PS3 console will be from US but the DVD will be bought in Nepal, will I still be able to play those dvd from Nepal.

Thanks in advance for any help.