In addition, the wall socket plug configuration is different in other parts of the world. For each electrical appliance you take on your trip, you must accommodate the change in voltage and the change in plug configuration. This is very convenient as it removes the necessity of a voltage adaptor. There are certain exceptions, such as laptop computers. If you have any questions about any appliance, contact the manufacturer for instructions.
Some appliances are available in battery-powered models.
This eliminates the need to consider plug-in voltage supplies. There are about a dozen different plug configurations used in various parts of the world. You are well advised to purchase individual plug adaptors for each electrical appliance you plan to take on your trip. In addition, country information is available at travel stores, usually in the display housing the plug adaptors and other travel gizmos. Le Travel Store in San Diego is a good source for voltage converters and plug adaptors.