The electrical supply in Ireland is 230v 50hz. The plugs and sockets are different from the USA involving a three-pronged formation, the same as those used in the United Kingdom. If your appliances operate on a different current (such as those from North America) you will need a power converter and plug adapter.
A plug adaptor does not change the electricity supplied to the appliance, only allows it to be plugged into a different type of wall socket. If the appliance you are using supports dual voltage and dual frequency then a plate/tag will be located on the item stating "120/240v, 50/60Hz".
Most laptop computer and battery chargers are dual voltage, so all you will need to use them with a different supply is a plug adaptor.
Power converters step down the voltage from 240v to 120v, allowing equipment which is not dual voltage to operate at the voltage for which it was designed. Converters do not alter the frequency at which electicity is delivered and should be used a maximum of 1-2 hours at a time.
Converters can be purchased at travel stores, some discount stores, office supply stores, and electronics stores. Make sure that you select a converter that will accommodate the wattage of the appliances you wish to operate. Some laptop computers, electric razors and hair dryers have built-in power converters. However, an adapter plug will be required. Adapters and converters may be found at Walmart and Radio Shack etc.
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