I have also shared how to calculate the resistance manually using its color code and its given after this resistor calculator tool. So, its a suggestion that not only use this resistor calculator but also learn how to do it manually because knowledge is always helpful plus there’s a chance that you won’t find internet when you wanna use our resistor calculator. 😛 So, here’s the online tool for resistor calculator:
I hope you have enjoyed this resistor calculator and it helped you in your Engineering Projects. Now I am gonna explain how to calculate resistance manually.
How to calculate resistance using color code ???
- First of all, resistance has four color bands on it as shown in the below figure:
- As you can see in the above figure, that there are four color bands on the resistance, where:
- First band is Red.
- Second band is Green.
- Third band is Black.
- Fourth band is Gold.
- Now let’s discuss these color values first and then we will come back to these bands.
- The first three color bands can have nine different color bands and these colors along with their values are shown in below table:
- Now you know the values of each color band.
- So, now let me tell you how to get the resistor value from these color codes.
- First and second color band values come as it is.
- In the above examples the first band was red and red band value is 2.
- Second band was Green and its value is 5.
- Now the third band value tells the number of zeros that will come after these two values.
- So, as the third color is black and its value is 0 so its means no zero will come after first two values so this resistance is of 25 ohms.
- Now let’s discuss the fourth color band.
- It is normally not considered in simple project but you should know what its mean.
- Fourth color band can either be Gold or Silver and its decides the tolerance of resistance.
- If fourth color band is Gold then it means the resistor has a tolerance of +/-5% and if its silver then it means it has a tolerance of +/-10%.
- If there’s no fourth color band means the resistance has only three color bands then it means it has a tolerance of +/-20%.
- So, now let’s discuss example of another resistance, given below:
- So the first band is Brown so first value is 1.
- Second band is Black so second value will be 0.
- Third band is Red and its value is 2, so there will be two zeros after first two values.
- So, overall the value will become 1000 ohm or you can say 1k ohm.
- As, the last band is silver so it has a tolerance of +/-10%.
So, that’s all about resistor calculator and also about how to calculate it manually. I hope you guys have enjoyed it and are gonna use it. Take care and have fun !!! 🙂