Why can some (US) outlets fit a plug from either way you put it in, but some plugs have a fatter and skinnier prong?
In: 8026
Polarity sensitive devices.
Like a lightbulb you dont want the whole ring around the bulb to be the part with the zappy zappy you want the little pin in the back so that when you unscrew the bulb you dont chamce getting the zappy zappy in your fingers.
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