Incorrect and untested methods will result in electrical hazards. Use a transformer (step up or step down whichever is applicable) of appropriate rating between the power supply and your appliance. This looks like a test bench experiment. Although your idea is theoretically possible, in reality it involves risks and poses safety issue as per electrical codes.I will be moving to Argentina, 220 V 50 hz. Will a simple diode of correct Amp rating in series reduce power and allow the use of my kitchen cooking utensles? How about simple power tools like a drill or saw?