hello, i am going to america for a year and i dont know if i will be able to take my various chargers and electrical things. can anyone shed some light on the subject ?
The US uses 120V.
Most chargers are dual voltage - check that yours are. Other appliances will probably work but not necessarily very efficiently. For example a kettle will take twice as long to boil.
Things that get hot like kettles, irons and hair-dryers - as per Dzug's comments. Things that have motors in them will probably just about turn around slowly. Things like audio-visual equipment powered off the mains probably won't work at all. You can get an inverter for US use that will drive about 60W.