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Electrical Circuits

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment exploring the basics of electrical circuits.

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We have a special guest with us here today to teach us some basics about electrical circuits. 00:00:00
We have Mr. Rick Walker, who is an electrical engineer from NASA Langley Research Center. 00:00:06
How many people think electricity is mysterious? 00:00:11
Why do you think electricity is so mysterious? 00:00:15
It's probably because we can't see it. 00:00:18
That's a pretty common answer, Jacob. 00:00:20
Most people have a hard time understanding things they can't see. 00:00:22
So to help us see how electricity works, we're going to use something that we all know about. 00:00:25
Let's go outside and learn about the basic components of a circuit using a fire truck and water. 00:00:29
Whoa! 00:00:34
Today we're with firefighters from the Fox Hill Company No. 5 in Hampton, Virginia. 00:00:37
Hey, guys. 00:00:40
Hi, Rick. 00:00:41
Let's say these guys were on the scene of a fire. 00:00:42
What are some things that they would need to be able to put the fire out? 00:00:44
Water. 00:00:47
And a fire truck. 00:00:48
That's right. 00:00:49
We'll need a fire truck filled with water. 00:00:50
What else? 00:00:51
What about a fire hose? 00:00:52
All right. 00:00:53
Now how do the firefighters get the water to the fire? 00:00:54
They hook up the hose to the fire truck. 00:00:56
Right. 00:00:58
We definitely have to have the hose hooked up to the truck. 00:00:59
So what we have here are the basic components of a circuit. 00:01:01
They have a power source. 00:01:04
They have conductors or wires and a load. 00:01:06
What do you mean by a load? 00:01:09
In a circuit, a load is a device that converts electrical energy into some other form of energy. 00:01:11
For example, in an electrical circuit, we use a light bulb to convert electricity into light. 00:01:15
The power source is what supplies our circuit with the energy to do work. 00:01:20
For example, a battery creates electrical pressure called voltage that will push electrons through the circuit. 00:01:24
On the fire truck, a pump creates water pressure. 00:01:30
The pressure will push the water out if there's a path for the water to flow. 00:01:33
The water travels to the load, which is our water cannon. 00:01:41
Okay, guys, whenever you're ready. 00:01:44
All right. 00:01:46
Whoa! 00:01:55
Now, let's go inside and compare this to an electrical circuit. 00:02:03
Who remembers what components we need to make up a simple circuit? 00:02:07
PJ? 00:02:12
A power source, conductors, or the wires, and a load. 00:02:13
That's right. 00:02:16
What we're going to do is use this battery as our power source, the wires as our conductors, and this lamp will be our load. 00:02:17
If we connect them in the right order, the circuit will be closed, and the light bulb will light. 00:02:23
Basically, what we have here is the battery creating an electrical potential called voltage, 00:02:28
which is pushing the electrons through the wires, up to the light bulb, and back around to the other side of the battery. 00:02:32
When this circuit's closed, the light bulb lights. 00:02:38
It's important to remember here that the battery is not creating electricity, but merely pushing electrons around the circuit. 00:02:41
So what would you call it if you disconnected one of the wires? 00:02:47
If it's called a closed circuit when the lamp is lit, then would it be called an open circuit when the lamp doesn't light? 00:02:51
That's right. 00:02:56
For example, the lights in our room right now, we have a closed circuit. 00:02:57
But if I was to go over to the wall and flip the switch, what would we have? 00:03:00
Exactly. 00:03:07
At home, you use devices like switches and circuit breakers and fuses to make open circuits. 00:03:08
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
497
Fecha:
28 de mayo de 2007 - 15:34
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 15″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
19.55 MBytes

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