Power converters are used to convert 220/240 VAC to 110 VAC to permit the use of “US” appliances in countries where the commercial power is 220 or 240 VAC. The main consideration is the current draw or power rating of the device to be used with the converter. The converter must, of course, be able to handle the power draw of the device being connected.

A foreign travel adaptor will handle electric shavers, even hair dryers, and appear like a wall adaptor. For appliances requiring more power, a transformer-type is available. The power cord has a US type plug on one end, European plug on the other. These converters will convert either way, 110 to 220, or 220 to 110, and are available in three wattage ratings. The plug makes it impossible to hook it up wrong.

In other countries, the commercial VAC frequency is often 50 Hz, where ours is 60 Hz. This can cause a problem with some electronic devices, such as TV sets, that rely on the 60 Hz for proper operation. Appliances such as electric shavers, hair dryers, etc., do not require any specific frequency, and it is these products that the converters were intended to be used with. Some consumer electronics such as tape players, etc., may work OK with a power converter, but trial and error may occur.