im going to be travelling to a country where the voltage is 220/240 instead of the usual 110/120, and im going to be bringing my ipod charger and laptop charger along. it says on the chargers "Input 100-240V". does that mean i dont have to buy any power converters for it, i can just plug it in? also, i have a 1600 watt power converter, but my hairdryer is 1875 watts. can i still use them together, or would that be a bad idea?