WEBVTT

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Adabot

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Billy

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Connie

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Ruby

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Flo

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Gus

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Cappy

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Circuit Playground

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(music)

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(toaster oven door closing)

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(electronic music)

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(hair dryer blowing)

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(silence)

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Uh-oh...

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Did I break something?

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Looks like you tripped the circuit breaker, Adabot.

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Wait. Who did I trip?

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No, no. The circuit breaker isn't a person.

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It's a device in that box over there.

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The circuit breaker turns off all the electricity

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when we draw too much electrical current.

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Ohhh!

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And it's also something only a grown-up should touch.

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Added to memory, Wow! Powering all my stuff

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must use a lot of current.

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That's right. And we measure electrical current in amperes.

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Huh! Why do we call it that?

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The ampere is named after the scientist

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Mr. André-Marie Ampère.

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Accessing database.

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(electrical beeping)

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André-Marie Ampère, a French scientist from the 1800's.

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That's right. And Mr. Ampère was very curious

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about how electricity works.

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Curious, like me?

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This is true.

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And he conducted many experiments

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to learn about electricity.

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(music)

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The result of these experiments showed Mr. Ampère that

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electricity is created by the movement of many teeny objects

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which are so small we can't even see them.

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Electrodynamic molecules?

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Nowadays we call these teeny objects "electrons".

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And when electrons move, we call that electrical current.

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Makes sense to me.

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Oh. Now I get it, Ladyada.

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But, how do we measure amperes?

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That's easy. We use a multimeter.

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Oh! I wish I had one of those!

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In this circuit, electrons flow from one end of the

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battery through the LED and then back to the other

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end of the battery.

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By setting the current through a multimeter,

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we're able to measure the amount of electrons

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flowing through.

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So this LED is using...?

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0.05 amperes.

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Correct.

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I wish I could see electrons move.

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Well, you may not be able to see every single electron,

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but you can see the effects of electrical current.

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Really? How do we do that?

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Well, you can see it when your boom box makes sound.

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Or when your toaster heats up.

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And you can feel it when your blow drier

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blows hot air at you.

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I get it. Electrical current makes electricity go!

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Those electrons are amazing!

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That's right, Adabot.

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Hey, you know you don't have any hair, right?

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What?

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Zut alors!

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(music)