Some things, even with an AC power converter won’t work at all. For example, don’t bother bringing a television with you. Despite being able to overcome differences in electricity with an international voltage converter you still will only receive rolling static as broadcast signals in Europe and North America are different. Another thing you need to worry about is old wiring. Bad wiring will defeat a transformer or a converter every time. Many older European hotels have older electric wiring and will not be able to support your 1000 watt travel iron. Luckily most hotels have warning signs; however, if lights start to flicker unplug your electrical device immediately.

And finally, be very careful with European bathroom electric shaver socket. They are designed for low wattage electrical appliances (shavers and toothbrushes) and are not meant for use with a hairdryer or curling iron.

Almost all travel converters require use of ac adapters (In fact I have never seen a travel converter that did not require use of an AC adapter) so make sure you bring some along on your trip. Most manufacturers of travel voltage converters sell them in kits with power adapters.