j is for joule

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0:00Rise and shine, Adabot. It's time for work.

0:07Work? Work!

0:08Uh, okay.

0:43Who are you? And what are we working on?

0:47My name is James Prescott Joule. Perhaps you've heard of me.

0:51I think so. Aren't you a scientist?

0:54Exactly. And I've spent my entire life studying the way things work.

0:59What do you mean by work, exactly?

1:02I'm so happy you asked. Let's get working and I'll explain.

1:07Um, okay.

1:13Long ago, I defined work as force multiplied by distance.

1:18So, if we know how much force has been applied over a certain distance,

1:23then we can know how much work has been accomplished.

1:27Force multiplied by distance?

1:31Exactly!

1:31As I'm sure you know, it takes much more work to lift something up above your head

1:36than it does to raise it a few inches off the ground.

1:40And when we measure force multiplied by distance,

1:43we do so using a unit of measurement known as the joule.

1:48Wait, I thought you were named Joule.

1:50I am. I named the unit of measurement after myself.

1:54It is my life's work after all.

1:58That makes sense.

1:59Let me give you an example.

2:01Okay.

2:02To the table.

2:03To the table.

2:08Ooh, how about them apples?

2:10Indeed, Adabot.

2:12So it takes a force of about one newton to lift this apple.

2:16And if I lift this apple one meter, then I've done one joule of work.

2:21Okay, but what if you lifted 40 apples?

2:25Forty apples would be 40 joules of work!

2:29Whoa, that's a lot of work.

2:30Indeed.

2:31Indeed.

2:34So, if we light this 3 watt LED for 3 seconds, then we've done

2:409 joules of work.

2:423 watts times 3 seconds equals 9 joules.

2:47Now similarly, if we light this 60 watt incandescent bulb for 1

2:53hour, then we'll have done 216,000 joules of work.

2:59Whoa, that's a lot of joules.

3:01Exactly. So, if you really wanted to save power, you might consider using

3:06something like this, a 12-watt LED bulb.

3:10Oh, that would be a smart move.

3:13Indeed, Adabot.

3:14So, to calculate joules, we multiply force

3:20and distance, or power and time.

3:27Precisely, Adabot.

3:29So, are you ready to get to work?

3:32I think so.

3:33Good, because we're scheduled for 5,000 joules of work today.

3:38Wait, what?

3:39Come on, Adabot. Let's make hay while the sun is shining.

3:42Wait, there's hay now too?

3:44Oh, it's just an expression, Adabot. Come on!