Like much of Europe, Asia and Africa, Greece uses 220-240 Volt, 50 Hertz current. In contrast, the United States, Canada and parts of Latin America use 100-127 Volt current with a frequency of 60 Hertz. That doesn't mean that you won't be able to plug in any U.S.-style device while in Greece. Most electronic manufacturers make their devices compatible with a range of current types so that they can be used both at home and while abroad.
Most electronic devices include a power-supply label with information about the device's current compatibility. This label is usually located on the back of the device, on the AC transformer box on the cable or molded into the plug -- almost always in very small print. In the case of U.S. electronics, look for a message indicating that the device functions across a range of currents. If your device says "INPUT AC120/240V 50-60Hz" or "INPUT AC100 -- 240V 50-60Hz" it is compatible with Greek current. If your device specifies a single current type -- "INPUT AC120Vac 60Hz" -- the device is not safe for use in Greece.
Even if your device is compatible with Greek current, you may need to purchase an outlet adapter to plug the device into a socket in Greece. Most outlets in Greece use the two cylindrical prong shape -- with or without a grounding point and similar to outlets used in France, Germany and Russia. If you're traveling with U.S. electronics with the standard two-line plug, you'll need an adapter for this type of outlet. If you plan on traveling extensively through Greece -- especially to remote areas -- or stopping off in other countries during your trip, a universal adapter with numerous plug shape converters is always a good investment. In most cases, a universal adapter will be less expensive than two or three outlet converters purchased separately.
In the event that your single-voltage device is not compatible with the current in Greece, you will need a transformer to bring the current down to a U.S. voltage rate. All you need to do is plug the transformer into the Greek outlet, set the output to the appropriate 100-127 Volt level and plug your device into the transformer output. Keep in mind that most modern devices work in a range of voltages and few travelers need transformers for basic appliances. Be sure to check the power supply label for your device before purchasing and packing a transformer.
