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TPR2-U5-QUEST4 - Contenido educativo

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Subido el 13 de abril de 2022 por Beatriz T.

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QUESTIONS 4 UNIT 5 ELECTRICITY

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I'm going to solve exercises from book page 143 that corresponds to the 00:00:01
questions number four that some of you have been asking me first one it's to 00:00:08
express this variable symbols so the first one is in millivolts remember that 00:00:16
from that one millivolt it's equal to 0.001 volts so having to count this you only have to divide 00:00:22
this figure by um 1000 so it's 0.037 volts next one um what you need to have into account is that 00:00:35
one kilovolt it's equal to 1000 volts so here what you have to do is to multiply 00:00:52
12 kilovolts by 1000 and here is exactly the same but be careful because 2.8 it's 00:01:03
a decimal figure and the third one is exactly the same and in the first so the 00:01:12
result is this one, 0.105 watts. Exercise 7 says that we have to indicate if they are in series 00:01:18
parallel or in series parallel. Remember that they are in parallel if they are connected to 00:01:29
the same points. For example, in this one, they are connected in this point and in this point, 00:01:36
so a it's in parallel um the second b um remember that the definition i say uh circuit is in series 00:01:41
if one device is after the other here we have three lamps they are connected one after the other 00:01:52
so this one is in series the set the third one is exactly the same but they have put here this 00:01:59
like MSC kit but it's in series and when you have one parallelism series and one 00:02:08
parallelism combination is in parallel then this is a combination of series 00:02:16
parallel here they are asking you to calculate the missing figure having in 00:02:20
account the Ohm's law and I have explained this thing in class that you 00:02:36
have the triangle of the Ohm's law V R and I here you can find it in the 00:02:45
internet or just check your book so depending on the figure you need to 00:02:51
calculate, you can guess the other figures. So let's calculate the 00:02:55
resistance in this example. Resistance is voltage divided by intensity. Just take 00:03:09
the figures 9 divided by 1. 9 volts divided by 1. The result is 9 ohms. So this is 00:03:14
result in this exercise in the first one voltage it's equal to the intensity by the resistance 00:03:26
intensity is in milliampere so transform it to one press okay and multiply it by the ohms by the 00:03:36
resistance that is 100 1000 ohms and this result it's one volt in the second one you have to 00:03:48
calculate the intensity the intensity is the voltage divided by the resistance so just take 00:03:58
the figures that is 25 divided by 1 kilo ohm 1 kilo ohm is 1000 ohms so you have this result 00:04:03
25 divided by 0.0 sorry 25 divided by 1000 that is us 0.00 sorry 0 25 amperes you can transform 00:04:11
this measure to 25 milli amperes and this exercise is done in exercise number two it says that 00:04:24
in a dcc kit with an involved battery it's providing a current of 0.03 amperes 00:04:40
through a resistor calculate the resistance of the threshold resistors and um 00:04:45
and do it in crocodiles and check the result okay we are going to do the first part the first part 00:04:51
you have to take your own flow and calculate the resistor the resistance is equal to the voltage 00:05:01
divided by the intensity and so it's 9 divided by 0.003 and plus take the calculator 9 divided 00:05:08
by 0.003 it's 3 000 ohms and when it's set let's take the calculator clips and check your result 00:05:28
it's three kilo ohms it's the same as three thousand ohms and here we have 00:05:49
nine volts how we can check it we have two things to do just put your mouse 00:06:07
over this and calculate the rhythm well it's not given I don't know why but 00:06:13
there is another way to do it you can add a voltmeter no an 00:06:22
ammeter here and this amateur is going to give me the result of three 00:06:28
milliampers that is the one that was said in the in the in the exercise I 00:06:35
take it and I paste it it said here draw a lamp with three lamps in series and a 00:06:44
I have an R15V battery. 00:06:59
In series means that one is after the other. 00:07:06
These are the three lamps. 00:07:11
And it said, R15V battery, it's here. 00:07:24
And calculate intensity. 00:07:31
We can measure it here, as I cannot do it. 00:07:33
I put an ammeter, that is a device 00:07:41
that measures the intensity. 00:07:45
and it says 15 million price. 00:07:47
This is the result. 00:07:49
You can paste it here in the exercise. 00:07:55
Idioma/s:
en
Autor/es:
BEATRIZ TORREJON
Subido por:
Beatriz T.
Licencia:
Reconocimiento - No comercial
Visualizaciones:
65
Fecha:
13 de abril de 2022 - 17:05
Visibilidad:
Público
Centro:
IES CERVANTES
Duración:
07′ 59″
Relación de aspecto:
1.78:1
Resolución:
852x480 píxeles
Tamaño:
20.07 MBytes

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