On a related note, when you go on vacation to Europe/etc where 220-240V is used, don't think that a cheap travel plug is going to let you use all your US appliances like hairdryers, laptops, etc that you may want to bring with you.
A typical travel plug doesn't have a voltage converter in it, and is only designed to let you plug your US devices into that European/etc 220V wall socket. Whether your device can handle it is another matter! A laptop with dual 110V/220V capability (read the label!) will work just fine, but a cheap 110V only hairdryer will burn out in short order!
The U.S. does use 220-240v for some applications and every house is wired for it--at least to the panel. Large appliances, car chargers, and other high current devices are almost always 220-240v in the home. But 240v between your hand and ground is twice as likely to stop your heart.
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A typical travel plug doesn't have a voltage converter in it, and is only designed to let you plug your US devices into that European/etc 220V wall socket. Whether your device can handle it is another matter! A laptop with dual 110V/220V capability (read the label!) will work just fine, but a cheap 110V only hairdryer will burn out in short order!