WEBVTT

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[unclear opening audio]

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Oh, hey Adabot, how are you doing?

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Oh, good. I was just wondering.

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Wondering about what?

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Why do some power cables have two conductors and some have three?

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That's a very good question, Adabot.

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The answer is these three prong cables are grounded.

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You mean, they're not allowed to go out and play?

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Oh, no, not like that.

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See, on this connector, we have a third prong, and that's the ground.

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We use these with appliances like this one for safety.

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If something goes wrong electrically inside, that extra dangerous electrical

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charge goes through the ground and not through you, which would cause a nasty

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shock.

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Ground? Like outside with all the dirt?

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That's right. The earth is ground.

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So anything connected to the earth is grounded.

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Huh? So let's say we're talking about things that are ground.

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How many can we find just by looking around?

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Are you kidding? That's easy. We're nearly surrounded.

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There's a lot of things here that are very well grounded.

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Like dirt.

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[unclear reply]

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Pipes.

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Yes, very true.

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A sink?

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Also connected to the earth.

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A tree?

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Well, yes, but it's not conductive.

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This rock?

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Uh-huh.

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That rock?

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You bet.

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A fire extinguisher?

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No way.

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A cup of tea?

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Not ground.

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An airplane?

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Same deal.

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A rubber ball?

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Not grounded.

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A lightning rod?

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Oh, most definitely.

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It doesn't take long to complete this search.

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Ground is anything conductive that's connected to the Earth.

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Hey, Adabot. Back already? That was quick.

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Yes, I found examples all over.

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You might say you covered a lot of ground.

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Oh, zing. Good one. Good one. That was good.

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I'll see you next time.