l is for led

automatic captions, checked for structure and key terms; corrections welcome.

0:02I got a right to sing the blues. I got a right to

0:08moan inside. I got a right to sit and cry

0:13down around the river.

0:17I love boxes.

0:19Whoa, what's that music?

0:21Oh, that's just Billie.

0:22Oh no, she sounds pretty sad.

0:25Yeah, don't go nuts. Billie's just got the blues again.

0:29[unclear reply]

1:05Hey, Billie, why are you so blue?

1:08I suppose that's just the way I am.

1:11So you've always been blue?

1:13Yeah, well, she's made with gallium nitride.

1:18Gallium what?

1:20Wait, what are you talking about?

1:22Well, Adabot, inside every LED is a small crystal.

1:27Really?

1:34When you connect the short leg of an LED to ground

1:37and the longer leg to positive voltage, voila!

1:41The crystal glows and the LED lights up.

1:46Very cool.

1:47So, electricity flowing through an LED's crystal creates light.

1:53But why are LEDs certain colors in the first place?

1:57The type of crystal used in an LED determines that LED's color.

2:02Oh, interesting.

2:06A red LED like me uses a type of crystal made of gallium arsenide.

2:11That's two elements, gallium and arsenic mixed together.

2:14I use an aluminum gallium crystal to get so green.

2:21And indium gallium nitride is what makes me so blue.

2:27oh so different crystals make different colored light

2:31but I've also seen LEDs

2:34that change color how do they do that well we usually call those color

2:40changing LEDs RGB LEDs hey I've got an RGB LED

2:46right here

2:46oh good let's take a closer look to see how they work

2:50we call them RGB because

2:54Because inside every one of them are three different types of crystals.

2:57One that makes red light, one that makes green light, and one that makes blue.

3:04I get it. RGB. Red, green, and blue.

3:08Exactly! And by mixing red, green, and blue, we can make pretty much any color we want.

3:15Like, say, purple.

3:20Or orange.

3:24Or even white.

3:30Wow. Thanks, guys.

3:32LEDs make a lot more sense now.

3:34You're very welcome, Adabot.

3:36LEDs are in so many electronic devices,

3:39screens, billboards,

3:41even light bulbs.

3:43Yeah. It's really important to understand how they work.

3:48Agreed.

3:49You know, Billie,

3:50you may be blue,

3:51but you light up my life.

3:54Awwww