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Measuring instruments - Contenido educativo

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Subido el 19 de diciembre de 2021 por David G.

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Hello. In this video tutorial I'm going to teach how to measure voltages and intensities. 00:00:00
We are going to use an online tool and here in the instructions you have the link to go to the 00:00:08
online tool. If we click on it, a new window appears and we are going to use the lab. 00:00:13
So click on lab, double click and we are in. So here on the left we have the components we are 00:00:22
are going to use so for instance I'm going to use a battery so I click and 00:00:31
drag if I want to rotate the battery I can click here on this side and I can 00:00:37
rotate it this way you see it now what else do I need I'm going to use a switch 00:00:41
remember we have studied the components of a circuit so we know what a switch is 00:00:46
We will also need a bulb, okay? You know what a bulb is. And we are going to use a 00:00:53
resistor. This is just an example, okay? And we have the four components and we 00:01:02
will need to connect them. We are going to click and drag pieces of wires 00:01:10
this way. I click and drag and I click and drag the extremes of the piece of 00:01:14
wire and this way I can connect everything. The bulb has two connectors, one of them here and the 00:01:23
other one is here, the red one, okay? If you want to remove a connection, just click on it and click 00:01:30
on the scissors. Have you seen the scissors? I will repeat. Click on it and if we click on the 00:01:35
scissors, the connection disappears, okay? So now we have our circuit. And what happens if I close 00:01:41
the switch. I will click on it. The switch is on. 00:01:51
Intensity is flowing through the circuit. Can you see the electrons moving? 00:01:55
You can decide if you want to see them or if you don't want to. 00:02:00
And if I open the circuit, electrons 00:02:04
don't move anymore and there is no electricity. 00:02:07
So I'm going to close the switch again. And now 00:02:11
because the electrons are moving, we have light on the bulb. 00:02:15
Perfect, fine. What else can we do with the circuit? We can modify, if we click on the battery, we can modify the voltage. Here I have, I mean, the battery is providing 9 volts. We can modify it to 10, 10.5, 11, whatever. 00:02:19
We can do the same with the resistance. The bulb has a resistance that can be modified, 9 for instance. 00:02:32
I can click on the resistor and I can modify its intensity, its resistance, 13 ohms. 00:02:42
So we can modify the voltage of the battery, the resistance of the bulb, the resistance of the resistor. 00:02:50
resistor, we can close and open the switch, and the bulb will shine or won't, like at 00:02:56
this moment, and if we close it, it shines, so we can do a lot of things. 00:03:03
What else can we do? 00:03:08
Well, here you have the circuit with the pictures of the elements, they look like they are in 00:03:09
real life, but you can switch to their symbols. 00:03:17
If we click here on the right, we have the same circuit, but instead of having the pictures 00:03:21
of the components, we have their symbols. 00:03:25
You see the switch? 00:03:32
We can open and close it, we can modify the resistance of the resistors. 00:03:33
Every time we want we can go back to the pictures or we can show the symbols. 00:03:40
We can switch between both of them. 00:03:46
What else can we do? 00:03:49
We can use voltmeters to measure the voltage and ammeters, both of them. 00:03:50
They are here on the right. 00:03:55
We are studying measuring instruments and here with this exercise I want you to learn 00:03:58
how to use them. 00:04:02
For example, the voltmeter, how can we use it? 00:04:04
We have two wires. 00:04:07
You already know that the voltmeter has to be connected in parallel. 00:04:11
It means that if we want to measure the voltage of this resistor, we will place the connectors 00:04:14
this way. 00:04:20
and now we have 6.50 volts this is the voltage for the resistor imagine that instead of placing the 00:04:23
red one here and the black one there we change both of them we have minus 6.50 it means that 00:04:32
the connectors has been connected the the in the opposite way but this is not a big problem 00:04:41
anyway if you have a minus here don't worry too much for the moment we will consider that 00:04:47
is 6.50 and forget about the sign, okay? Forget about the minus, okay? So this is 00:04:52
the way we measure the voltage of the resistor. And how can we measure the 00:04:59
intensity that is crossing the resistor? We are going to connect the ammeter, the 00:05:05
one that is here, and we are going to connect it here in series. If you have 00:05:10
read the theory, you will know that ammeters are connected in series. So how 00:05:15
can we do it? We are going to remove this piece of wire, for instance, and we will 00:05:20
place the ammeter here. So now the ammeter is connected and the same 00:05:25
intensity that is crossing the resistor is crossing the ammeter and this 00:05:35
intensity is 0.50 amperes. So now we know that the voltage for this 00:05:39
resistor is 6.50 and the intensity is 0.50. Does it make sense? Well, let's have a 00:05:46
look the resistance is 13 ohms the intensity I mean the resistance of the 00:05:52
resistor the intensity of the resistor is 0.50 and the voltage is 6.50 does it 00:05:58
make sense yes because if we apply the ohms law we are going to I want to show 00:06:04
both of them at the same time if we apply the ohms law we know that voltage 00:06:10
equals voltage here is 6.50. Intensity here is 0.50 and the 00:06:15
resistance is 13. Okay. Is this equation true? If we multiply 13 by 0.50 is the 00:06:34
result is 0.50. Let's have a look, and if we multiply 0.50 by 13, the result is 6.50. 00:06:44
So the Ohm's law is working for the resistor as expected. So we have learned how to measure 00:06:59
magnitudes using the voltmeter and the ammeter, and we have checked that the Ohm's law is 00:07:08
working okay so be sure you have understood how to use the voltmeter and diameter because in this 00:07:13
in the questions of this part of the of this task you will find questions about 00:07:20
measuring voltages and intensities okay so i hope you have understood everything and 00:07:26
whatever you need to ask don't hesitate okay bye 00:07:33
Idioma/s:
en
Subido por:
David G.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
9
Fecha:
19 de diciembre de 2021 - 13:42
Visibilidad:
Público
Centro:
IES MARIE CURIE Loeches
Duración:
07′ 38″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
21.24 MBytes

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