young how are you? Edgar here greeting you again from Yo Reparo. how are they?
happy here to see their faces smiling, waking them up in the morning with one more video
Today I grab the afternoon making this video, but here we are fulfilling what we said, remember that my intention is that we learn the basic concepts, we are not getting into such a definition so complicated
I want to make this easy, if you are curious and want to learn a lot more, there are many books that will help you, that will get you out of doubt to be able to feed more of this knowledge
what I want is to create these bases, to accompany them in this learning curve so that they can have good bases so that when we start with the diagnosis we understand and understand some things that I have seen some of them...
so, in the previous videos we saw two important units, the first one we saw was the ampere, amps, or amperage. This is the unit in charge of measuring the electrons
the amount of electrons that are passing in a certain place for a certain time, so that will be the amperage
We also saw that someone has to push us, that force, that potential difference we are going to call the voltage, those are the two units that we saw earlier. And now we are going to see the last one called Resistance
as its name implies, the concept of resistance says; is the opposition that electrons receive when moving through a material
is the opposition, so it means that when the electrons come there is a strong man saying no no no no you are not going to pass, just pass by yourself but you stop there
then she is stopping the current and only lets a certain amount of electrons pass, a certain amount of current
we will be measuring the resistance in ohms and its symbol is the omega
we are going to call the materials that represent a high resistibility insulators, it means that they do not conduct many electrons, they do not conduct much current like rubber, plastic and all those
and the materials with a low resistibility we are going to call conductors, such as copper, silver, gold. The electrons can flow there without any problem, they can run and get to the other side without any problem.
but all the electrons that are stopping there, that are not letting them pass are turning into heat or light for example
But why do I want to limit the Edgarito current, what is that for?
So, let's go to the tablet here and we will make the following drawing
Imagine that we have a battery, my battery is 5 volts and 3 amps, in this battery we are going to run 2 wires here, and here I have an IC, we are going to call this IC2 and this we are going to call IC1
these are grounded here with the circuit and the engineer here, these calculations are not made by us, the engineer said well this circuit has to work with an ampere of current
and this has to work with 1.5 current
here
so I have a battery that has 3 amps, that battery is full of 3 amps I have 2 circuits but those circuits do not work with 3 amps, if I put 3 amps on those circuits they will burn me
then there enters the concept or idea of resistance
I can have a resistance here and another resistance here, which depending on its value in this case can have a resistance here of 5 ohms and here I can have a resistance of 3 ohms
what this resistance is going to do is that it will grab the current and they will limit it and all this here will work with an ampere, and what follows will continue here and it will feed with 1.5 amps
in this way, taking advantage of stopping this resistance, stopping those electric charges, we can take advantage of the electrons, we can send them wherever we want
and thus be able to feed a lot of circuits, we are going to put a circuit here a circuit here and in this way we are going to operate all our phone
yes Edgar but you put there 5 ohms 3 ohms, how does that come out, how do I know I have to put up that resistance
We have already seen what is amperage, we have already seen what is voltage, we have now seen what resistance is, these 3 have to be related to each other
if you realize this circuit is quite simple but the three are related
in order to express this relationship, or to be able to calculate these three, then this is where ohm's law comes in
to start ohm's law, let's start by talking about V being equal to voltage, let's say that I is equal to current and let's say that R is equal to resistance
these are the three concepts that we saw earlier, now how can we calculate this if we only have two values, how can we do these calculations
so we are going to use this simple formula V which is voltage, I which is current for R
so what are we going to do? If I need to remove the voltage, how much voltage do I need for a circuit that is supplying so much current and that there is so much resistance
So what I do is, I plug voltage and I grab my current for my resistance and in this way I am going to get my voltage
now if I need to know the current then I plug current and divide my voltage by the resistance
Now if I want to know how much resistance is what I need, we cover resistance and divide voltage between current
So if I want to calculate the circuit I made earlier, then we will draw them again
So I have a battery, my battery has 5 volts and 3 amps, so we said that this battery will power an IC2 and this will be IC1
this will be grounded, now here I need to put resistors because they told me that this works with 1.5 and this one with 1 amp
so I need to know the value of these resistances, if we follow formula R it will be equal to divided voltage current
in this case we have the voltage 5 volts divided by the current that would be 1 amper, 1000 and that will give us a total that would be 0.005 which in this case is 5 ohms
Now we know that this resistance will be worth
5 ohms
Now I need to get this resistance out, again 5 divided by 1500 which is equal to 0.003. That in this case this resistance would be 3 ohms
and in this way we can do the same with the voltage, we can do the same with the current, just following this formula which is the easiest
where v is voltage
I is current
and R is resistance
in this way we can know the relationship of these 3, we can make calculations that maybe later will help us
either to be some voltage divider etc, etc
Ok gentlemen, then we are going to leave this class here, I hope you liked it and always get the most out of it
We have already seen three very important concepts that will serve us throughout this course, three concepts that we will be occupying all the time.
I want to take advantage of this video to send a greeting and a warm hug to Daniel Bustamante one of my tutors, the truth is that I learn a lot with him
gentlemen, do not forget to subscribe to canar like it and above all enjoy and learn from this
I'm leaving! I'm going to rest and see what we prepare for tomorrow, see you soon, bye