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Why do the plugs on some appliances have two prongs and others have three? - BrainStuff

BrainStuff

When you look at a normal 120-volt outlet in the United States, there are two vertical slots and then a round hole centered below. Take a look at this HowStuffWorks article to learn why appliance cords are shaped this way.

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Why do the plugs on some appliances have two prongs and others have three? - BrainStuff