Electricity takes the path of least resistance. This is why dropping your curling iron in your tub while you're in it is a bad idea: your body doesn't have much resistance. Neither does tap water and the pipes that carry it. The floor, generally, does however (but not always, so don't rely on it). The general idea is, it flows through tap water and you really well (not distilled water, though, which is why you rarely see it going through the air), and thus the electricity can go through the ground much easier than going through your appliance, so the path of least resistance is you, the water, and the ground, which makes for a really bad day if you end up in that scenario. This nugget of information will be useful when we talk about transistors.

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