In most of the world, household outlet voltage is 220 volts. In the United States and neighboring countries, however, household outlets run at 110 or 120 volts. This can pose a serious problem for travelers. Connecting a 220 volt appliance to a 110 volt outlet can damage or destroy the appliance. Fortunately, voltage adapters, which completely fix the problem, are cheap and easily available.
Converting an Appliance from 220 to 110
Buy a 110 volt to 220 volt adapter. While this may sound backward, remember that the wall voltage is 110 volts and your appliance needs 220 volts to run, so you need a device that will take 110 volts and step it up to 220 volts (in short, 110 mains to adapter to 220 device). These are available in most electronics stores and usually cost less than $20. Many of them will also say explicitly on their packaging that they are designed to let you use European appliances in the United States.
Connect the voltage adapter to the 110 volt wall outlet. Depending on what part of the world you are in, you may also need an outlet adapter to connect the voltage adapter. Most travel guides have information on the types of outlets that are used in different countries. Before traveling, consult one of these to make sure you will be able to plug your voltage adapter into the wall outlets. Outlet adapters are also inexpensive and available in most places that sell electronics or travel supplies.
Connect your 220 volt appliance to the outlet on the 110 volt to 220 volt voltage adapter. Verify that the outlet shape on your voltage adapter matches the outlet shape your appliance uses. If it does not, you can attach another outlet adapter to your voltage adapter to make it match with your appliance.
Use your appliance normally. If your voltage adapter is functioning properly, you should notice no change in the function of your appliance.