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in this lecture i'm going to talk about the resistor the resistor is an electrical component that reduces the electric current and voltage in other words it has a specific never-changing electrical resistance the resistor resistance limits the flow of electrons through a circuit and its resistance measured in ohm so that means that the resistor is an electrical component okay the uh this component reduces the electrical current and the voltage so that means that this component reduces the value of electric current and voltage in other words we can say that this resistor has a specific never changing value of resistance of electrical resistance this electrical resistance or this value of electrical resistance that exists inside this resistor limits the flow of electrons through a circuit so that will make the voltage and the current or that will reduce the value of the voltage and current this resistance measured in ohm as we know section 1 talks about the types of resistors bands before we begins before we begin explaining the types of resistors we can we must know what is these bands these colors that exist on the body of the resistor are called bands from these bands we can calculate the value of the resistor using a table with a specific value of for every color which means that from these colors or from these bands these lines the one line called bend so these four lines or there is five lines or more so these lines are called are called bands from these bands we can calculate the value of resistor uh using uh and using a table in this table there is a specific value for each color there is a four types of resistor first one is the four band resistor second one is the the five band resistor third one is the six band resistor fourth one is the variable resistor the first type the four band resistor we calculate the value by putting the first and the second digit and then we times it with the third digit and plus or minus the fourth digit so that means that this is the table that we are using to calculate the value of the resistor if we have a resistor a four band resistor this four band resistor has four colors okay for each color there is a value for example the plaque the value of black is zero at the first band the the the value at the first band is zero the value of black at the second band is zero the value of black at the multiplier or the third band is 10 power 0 and the fourth band the tolerance band there is isn't value or the black shouldn't be in the fourth digit or the fourth band so how to calculate this value or the value of this resistor first thing that we need to know is to put the first and the second digit so that means that we are going to put the value of the first and the second band or digit we can call it band or digit and then we times it with the third digit so that means that we will time times or we will multiply the values that we have put it with the four with the third digit or the third band and then we are going to put plus or minus the fourth digit by the way the tolerance is the uh fault percentage uh because the accuracy accuracy or the the the value of the resistor the resistance of the resistor not is not very accurate so the tolerance is the fault percentage of the value that comes out or the value of the resistance of the resistor for example if we have this resistor for example this resistor has the plaque at the first digit and red at the second digit blue at the third digit and this is a silver at the fourth digit first thing that we will do is to put the first and the second value of the first and the second color so the value of the first color the plaque equals to zero at the first band value then the second band value at color red it is the two the value two so that means that the value is zero two means that the value is only 2 because the 0 doesn't have any value then we will multiply it with the third digit and the third digit equals to the blue equals to 10 power 6. so we are going to times or multiply this 2 with that 10 power 6 and then we put plus or minus plus or minus what we have the fourth digit is a silver and the silver equals 2 plus or minus 10 percent and we will put plus or minus 10 percent okay and the plus or minus 10 percent means that the value of this resistor equals to 2 million ohms and plus or minus ten percent means that there is a fault percentage equals to ten percent and also we can say that this is two plus or minus ten percent mega ohms because the uh one million ohm equals to one mega ohm so these two millions ohms equals to two mega ohms so the value of this resistor equals to two plus or minus ten percent mega ohms and we have the five band resistor the five band resistors the second type of resistors consist of five bands or five digits uh first digit and the second and the third has the same value like this so we put the first the second and the third band of the resistor the value of this the these three bands of the resistor the first band is black so the value of black is zero so we are going to put zero then the second value or the second color is red and the value of the second curl color is two so we are going to put two then the third digit or the third band equals to or its color is green so the value of the green is 5 so then we have 25 [Music] 25 of the the first three bands then we are going to multiply it to the fourth band so the fourth band equals to yellow or the color of the fourth band is yellow so the value of yellow is 10 power four so the value of this resistor is 25 multiply or times 10 power four plus or minus we have the fifth band is and a blue and the blue in the fifth band of the five band resistor equals two it also a tolerance and this equals two plus or minus zero point twenty five percent so now we have the value is 25 times ten power four plus or minus 0.25 uh percent so that will equals 2 the 25 the 25 times 10 power 4 it will equals to 2 and 500 ohms plus or minus 0.25 percent and that also will equals to we know that 1000 ohms equals to 1 kilo ohm so we are going to say that to this number equals to 250 times 1000 and we will cancel this 1000 and we'll we'll replace it with uh letter k or kilo ohms so that will equals to 250 plus or minus 0.25 percent kilo ohms so this is the value of this resistor we can also use a much easier way to calculate the value of the resistor this way is by using an apps or applications these applications are we can find find it on app store or play store on your on your smartphone so that means that we can also use a program or applications to calculate our resistors value there is a famous application this application exists only on the android phones and called electro electrodroid this electrodroid is a very useful application we calculate from it the value of the resistors the variable resistors the variable resistors is the fifth i guess the fourth type of the resistors the last type of resistors is the vape resistor and that type consists of two types first type is the trimmer we can set its value using a screwdriver so we have the vape resistor this is the trimmer type of the vape resistor the variable resistor is a normal resistor but we can control its value or change its value using for example a screwdriver at the trimmer type this type is a resistor that we can set its value using a screwdriver and the second one is the potentiometer the potentiometer is a variable resistor a resistor that we can set its value it the resistance value of this resistor using our hands to rotate this pin okay these are d3 our potentiometer and this is the trimmer symbols of resistors these are the samples of the types of resistors we have the first type this is the simple that exists in the circuit diagram of the circuit diagram that we use to design our circuit first type is the normal resistor and this is it's uh it's simple and this is its shape on the rear life we have also a power resistor used to dissipate high power this resistor used in high power devices if we have a high power device that consume high power rating this is its resistor that we will use it has the same sample of the first resistor we have another type of resistor this type of resistor called ledr or light dependent resistor this light dependent resistor is a normal resistor but it changes its value depending on the density of the light intensity of the light we are going to explain this resistor afterwards in i guess next lectures and this is it's simple and this its shape in the real life we have the vapor resistor this is it the simple of the variable resistor this simple or this simple and these are the shapes of the variable resistors that's it in this lecture thanks for watching and i hope to see you in the next lecture