eli5: why do some plugs only have 2 flat prongs and others have a third cylindrical one?
In: 3
The three prongs are hot, neutral, and “ground.”
The “ground” is not required (though should be, imo) in all devices as the neutral is usually enough to act as a “ground” unless it is a very powerful device.
The third prong is there to help create a connection between the electricity and the ground that isn’t you in the event that electricity goes somewhere it shouldn’t.
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