WEBVTT

1
00:00:00.000 --> 00:00:04.200
Adabot, Billie,

2
00:00:05.600 --> 00:00:10.280
Connie, Ruby, Mho,

3
00:00:10.740 --> 00:00:14.520
Gus, Cappy,

4
00:00:16.360 --> 00:00:17.660
Circuit Playground.

5
00:00:48.260 --> 00:00:51.920
uh oh did i break something

6
00:00:54.600 --> 00:00:58.780
looks like you tripped the circuit breaker Adabot wait who did i trip no no the

7
00:00:58.780 --> 00:00:59.260
circuit breaker

8
00:00:59.260 --> 00:01:02.900
isn't a person, it's a device in that box over there. The circuit breaker turns off

9
00:01:02.900 --> 00:01:07.860
all the electricity when we draw too much electrical current and it's also something

10
00:01:07.860 --> 00:01:14.000
only a grown-up should touch. Committed to memory. Wow, powering all my stuff. Must use

11
00:01:14.000 --> 00:01:18.960
a lot of current. That's right and we measure electrical current in amperes. Huh, why do

12
00:01:18.960 --> 00:01:23.660
we call it that? The ampere is named after the scientist, Mr. André-Marie Ampère.

13
00:01:24.620 --> 00:01:25.100
Accessing

14
00:01:25.100 --> 00:01:30.740
database. André-Marie

15
00:01:30.740 --> 00:01:35.280
Ampère, a French scientist from the 1800s. That's right and Mr. Ampère was

16
00:01:35.280 --> 00:01:40.580
very curious about how electricity works. Curious? Like me? This is true. And he

17
00:01:40.580 --> 00:01:41.240
conducted many

18
00:01:41.240 --> 00:01:43.000
experiments to learn about electricity.

19
00:01:48.440 --> 00:01:51.080
The results of his experiments showed Mr. Ampère

20
00:01:51.080 --> 00:01:56.580
that electricity is created by the movement of many teeny objects which are so small we

21
00:01:56.580 --> 00:01:57.660
can't even see them.

22
00:02:01.920 --> 00:02:03.040
Electrodynamic molecules?

23
00:02:03.800 --> 00:02:09.660
Nowadays, we call these teeny objects electrons and when electrons

24
00:02:09.660 --> 00:02:11.160
move we call that electrical

25
00:02:11.160 --> 00:02:11.600
current.

26
00:02:15.700 --> 00:02:16.920
Makes sense to me.

27
00:02:23.200 --> 00:02:27.340
Oh, now I get it Ladyada, but how do we measure amperes?

28
00:02:27.560 --> 00:02:30.040
That's easy. We use a multimeter.

29
00:02:30.680 --> 00:02:33.200
Oh, I wish I had one of those.

30
00:02:36.180 --> 00:02:40.400
In this circuit, electrons flow from one end of the battery, through the LED,

31
00:02:40.400 --> 00:02:42.620
and then back to the other end of the battery.

32
00:02:44.160 --> 00:02:46.120
By sending the current through a multimeter,

33
00:02:46.380 --> 00:02:48.820
we're able to measure the amount of electrons flowing through.

34
00:02:54.800 --> 00:02:56.820
So this LED is using...

35
00:02:56.820 --> 00:02:59.580
0.05 amperes.

36
00:02:59.760 --> 00:03:00.060
Correct.

37
00:03:01.980 --> 00:03:04.200
I wish I could see electrons move.

38
00:03:04.480 --> 00:03:07.320
Well, you may not be able to see every single electron,

39
00:03:07.320 --> 00:03:09.720
but you can see the effects of electrical current.

40
00:03:09.720 --> 00:03:11.680
Really? How do we do that?

41
00:03:11.920 --> 00:03:14.380
Well, you can see it when your boombox makes sound.

42
00:03:14.640 --> 00:03:16.660
Or when your toaster heats up.

43
00:03:16.840 --> 00:03:19.520
And you can feel it when your blow dryer blows hot air at you.

44
00:03:20.180 --> 00:03:22.820
I get it. Electrical current makes electricity go.

45
00:03:23.400 --> 00:03:25.220
Those electrons are amazing.

46
00:03:25.760 --> 00:03:26.740
That's right, Adabot.

47
00:03:27.220 --> 00:03:29.860
Hey, you know, you don't have any hair, right?

48
00:03:30.260 --> 00:03:30.600
What?

49
00:03:31.320 --> 00:03:32.240
[unclear speech]

50
00:03:46.180 --> 00:03:49.160
We'll see you next time.