# Curso básico de Electrónica #1 Resistencias!

Jul 01, 2023but then it would be 150% so it gives me 15 kilos and well and so we find the value of this and the value of the tolerance is brown so it is one percent these are the so-called precision resistors welcome to my channel on

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onics practices on this occasion It is going to start with an### electr

onics tutorial course and I am going to start with the resistance. This course I hope will be very useful to people who repair electronic devices, to students and to people who like it or who want to learn electronics. We are going to start resistance.With this topic, in any device that you put together you will always find the largest number of components that will be resistance, that is, they will be the most numerous. For example, let's assume that in this card, look, this is a high and low voltage protector, so we can See the large amount of resistance we have, we can try to count the games 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 since it is quite numerous how they can be realized with respect to The other components, well, in fact, resistors are the most common elements in electronics and for example, here I also have a cell phone charger.

We can also see that there are more resistors than any other element. You should also notice that the resistors have different sizes. and they come in different shapes, for example, the most common residence is generally this shape, they are like cylinders and they have stripes with certain colors, so what we are going to be interested in is knowing about the resistance because basically recognizing them on the cards or in the designs also knowing its value, how to understand what its value is and what its power or current is that it supports, so within resistors there is a very particular case, like I put it here, which is like a little wire, look at the most basic resistance that you are going to find, it is going to be a little bridge, even if you think that this is not a resistance, it really is because the most basic resistance is a bridge that has a zero value, this is a zero value resistance and we have it and we also have it on the plates if you pay attention. for example here we have a little bridge here we have another little pot but it is a particular case ok and as we know how we can know what the value of coffee 700 is and I showed you a table for the color code of the resistance the resistance can also be divided In terms of power, here we have larger, rectangular-shaped resistors, so notice in this case we can see directly above its value, which is 150 years, and its power, for example, 3 watts, and in the case of the colored resistor.

Because of the color code we cannot directly see the value and its power because we have to look for it through a table but the power would be associated mostly with the size. I am going to tell you something about electronics for those who are new to this. issue when you see a component that is larger you associate those that consume more current or with more power always like this for almost all components it includes not only the resistors but most of the components the other case that we have of the resistors is the resistance surface mount, although I don't have any here, the surface mount repetitions are very small and generally have a code on top of them that I am also going to apply later so that you know how to read the values of the surface mount resistors, we are going to see how A particular case currently uses more surface mountain than through hole as in this case but we are going to explain the two cases ok as you can see here here I have a resistor that has several bands this is the most common one that has four bands or They have four colors.

You have to learn the color code of the resistors. In fact, this color code is also used for capacitors. This is the most common case. This type of four-color resistance is generally 5%. In the first tests you learn, is this table here you have to know that black is equivalent to 0 that brown is a red one of 2 and so on you have to learn this by heart it is very easy to learn it once you know that how do we identify the value of a resistor like this then it is very easy the first line is the first figure the second line is the second figure the third line or the third band is the applicator that we have here and the fourth is the tolerance so how do you know which is the first and which is the last because someone could get confused and say well and if I think that this is the first one, generally the last one is the tolerance one and notice that the tolerance values are very distinctive, for example gold plated or it has no color and it is also separated from the rest of the the colors, if you know that, then we can decipher what values of this resistance, for example, look at brown, it would be, we are looking here for brown in one, black is zero, so it would be 10 now x how much for red, which would be 2, that is, it would be 10 to the 2, which is the same as saying 100 so 10% would give me 1000 so this resistance is one kilo or 1000 omnium and the strip is gold therefore it is 5% so it is one kilo minus 5% then in the trade what resistance do we find then there is a table preset for 5% resistance where you cannot search for any value the values are also already preset you keep in mind only this then you would find 1 of 12 of 15 18 22 27 33 39 47 5.1 5.6 5.8 5.2 you will not find values commercials for example of 2.3 will never incorporate them nor will it find one of 28 for example I have others are these values now nothing else is learned in this part and then multiply if you want now one of a following value for example this would be 1 truth is that in the range between 10 and 20 then you would find here 10 12 which is how to multiply this same by 10 look at 15 and so on and if you want in the highest range with another 0 more you can simply multiply and thus you get them in the market, that is, you are going to find it exactly as it is here, that is, it is going to find you 120 kilos because we had to say 1.2 x 100,000, so well, this is what you are going to find in the market, this is for the case of four-band resistance. or four colors now there are also resistors with more bands that are d resistors and we move on to this case, notice 5 bands in 5 bands, another number is added here then it would be the same as in the previous case the first defines a number for us the second another number but the third is another number and the multiplier is the fourth and the fifth band then it is the tolerance generally in this case the tolerances are achieved more than 1% and 2% because these are the so-called precision resistors like the one we have here like the we could identify then brown in one green is 5 so it would be 15 black is 0 so it would be 150 The tolerance is brown, so it is 1%.

These are the so-called precision resistors. There is also a particular case of six-band resistors. It is the same up to this point as if it were five bands, but the only difference is this band. The last one is the coefficient of resistance. temperature basically the consequent of temperature is what tells us how much its resistivity varies according to the temperature but the rest is the same that is to say that we basically calculate it the same way we can do the exercise here 6 is blue red is 2 black is 0 so it would be 620 and the fourth color is the multiplier so it would be per thousand because it is orange so it would be 620 thousand kilos and then we have the tolerance which in this case says that it is 5% it is very rare that this happens that this is 5% but because generally They are one or two percent and the coefficient is brown therefore from 100 temperature coefficient well those are all the cases we have to obtain the value of the resistors when you see it on a circuit board now let's move on to the power as we know what power a cylindrical resistance has if it does not indicate it anywhere we already know what its value is but we do not know what its power is remember that I had told you before that the size is associated with the power so as it indicates it is from From the physical point of view, let's say this because of the size, the size is a reference for us, the power, so here is the table: 3.5 millimeters is equivalent to an eighth of a watt, meaning that the smaller one consumes less, therefore, it supports less current and the one that follows 6.4 millimeters would be 1.14 watts and so on 1 centimeter and a half watt 1.3 centimeters one watt 1.8 centimeters 2 watts and 3.4 centimeters 3 watts this is the afternoon so for the topic of power so you already know how to calculate the power according to the size and Last but not least is the symbology and how to identify the resistance in a circuit.

For example, the resistance has two standardized symbols that will find the license in this way or in this way, either of the two is valid, the resistance indicator It is usually referenced with an r and the unit is the omnium and the omega symbol so if we say a resistance value for example 500 we did 500 500 ohms with the symbol mega it doesn't matter let's see with the example here here we have three resistors true and then they were listed in the following way r which is the identifier and one in the numbering because as there are several you have to put the numbering after the r so it would be r1 r2 and r3 and the values are here with the symbol of a mega so Well, this way you should be able to identify it in any circuit that you see and if you see it with this symbol, then it is the same.

This symbol is also used in the same way in electronic circuits. Well, let's see this up to here for the next tutorial or talk to you about the surface mount resistors how to identify all their values and all that topic remember as always subscribe like and comment prevent another repair video that I am preparing also so see you in the next video 2 yes

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