WEBVTT 1 00:00:00.000 --> 00:00:03.620 Rise and shine, Adabot. It's time for work. 2 00:00:07.000 --> 00:00:08.180 Work? Work! 3 00:00:08.660 --> 00:00:09.460 Uh, okay. 4 00:00:43.720 --> 00:00:46.880 Who are you? And what are we working on? 5 00:00:47.020 --> 00:00:50.460 My name is James Prescott Joule. Perhaps you've heard of me. 6 00:00:51.100 --> 00:00:53.660 I think so. Aren't you a scientist? 7 00:00:54.040 --> 00:00:58.500 Exactly. And I've spent my entire life studying the way things work. 8 00:00:59.140 --> 00:01:01.920 What do you mean by work, exactly? 9 00:01:02.280 --> 00:01:06.980 I'm so happy you asked. Let's get working and I'll explain. 10 00:01:07.680 --> 00:01:08.380 Um, okay. 11 00:01:13.280 --> 00:01:18.300 Long ago, I defined work as force multiplied by distance. 12 00:01:18.780 --> 00:01:23.240 So, if we know how much force has been applied over a certain distance, 13 00:01:23.520 --> 00:01:27.100 then we can know how much work has been accomplished. 14 00:01:27.860 --> 00:01:30.720 Force multiplied by distance? 15 00:01:31.140 --> 00:01:31.620 Exactly! 16 00:01:31.980 --> 00:01:36.840 As I'm sure you know, it takes much more work to lift something up above your head 17 00:01:36.840 --> 00:01:39.680 than it does to raise it a few inches off the ground. 18 00:01:40.140 --> 00:01:43.520 And when we measure force multiplied by distance, 19 00:01:43.780 --> 00:01:47.320 we do so using a unit of measurement known as the joule. 20 00:01:48.020 --> 00:01:50.620 Wait, I thought you were named Joule. 21 00:01:50.900 --> 00:01:54.380 I am. I named the unit of measurement after myself. 22 00:01:54.820 --> 00:01:57.620 It is my life's work after all. 23 00:01:58.240 --> 00:01:59.440 That makes sense. 24 00:01:59.720 --> 00:02:01.040 Let me give you an example. 25 00:02:01.420 --> 00:02:02.000 Okay. 26 00:02:02.540 --> 00:02:03.260 To the table. 27 00:02:03.640 --> 00:02:04.420 To the table. 28 00:02:08.140 --> 00:02:10.460 Ooh, how about them apples? 29 00:02:10.680 --> 00:02:11.780 Indeed, Adabot. 30 00:02:12.620 --> 00:02:16.280 So it takes a force of about one newton to lift this apple. 31 00:02:16.500 --> 00:02:21.440 And if I lift this apple one meter, then I've done one joule of work. 32 00:02:21.740 --> 00:02:25.080 Okay, but what if you lifted 40 apples? 33 00:02:25.840 --> 00:02:29.040 Forty apples would be 40 joules of work! 34 00:02:29.220 --> 00:02:30.800 Whoa, that's a lot of work. 35 00:02:30.880 --> 00:02:31.260 Indeed. 36 00:02:31.900 --> 00:02:32.320 Indeed. 37 00:02:34.900 --> 00:02:40.540 So, if we light this 3 watt LED for 3 seconds, then we've done 38 00:02:40.540 --> 00:02:42.680 9 joules of work. 39 00:02:42.960 --> 00:02:46.640 3 watts times 3 seconds equals 9 joules. 40 00:02:47.200 --> 00:02:53.080 Now similarly, if we light this 60 watt incandescent bulb for 1 41 00:02:53.080 --> 00:02:58.980 hour, then we'll have done 216,000 joules of work. 42 00:02:59.360 --> 00:03:01.480 Whoa, that's a lot of joules. 43 00:03:01.480 --> 00:03:06.140 Exactly. So, if you really wanted to save power, you might consider using 44 00:03:06.140 --> 00:03:10.260 something like this, a 12-watt LED bulb. 45 00:03:10.820 --> 00:03:12.840 Oh, that would be a smart move. 46 00:03:13.140 --> 00:03:14.240 Indeed, Adabot. 47 00:03:14.860 --> 00:03:20.660 So, to calculate joules, we multiply force 48 00:03:20.660 --> 00:03:25.060 and distance, or power and time. 49 00:03:27.060 --> 00:03:28.260 Precisely, Adabot. 50 00:03:29.980 --> 00:03:31.980 So, are you ready to get to work? 51 00:03:32.360 --> 00:03:33.380 I think so. 52 00:03:33.620 --> 00:03:37.460 Good, because we're scheduled for 5,000 joules of work today. 53 00:03:38.400 --> 00:03:39.480 Wait, what? 54 00:03:39.780 --> 00:03:42.700 Come on, Adabot. Let's make hay while the sun is shining. 55 00:03:42.960 --> 00:03:44.160 Wait, there's hay now too? 56 00:03:44.400 --> 00:03:46.980 Oh, it's just an expression, Adabot. Come on!