Obviously not a value that you could have indicated with the 4 band resistor code and so the five band code was introduced. You can now get a 287 ohm resistor for instance. As manufacturing techniques improved and electronics has become more precise, extra values of resistors have appeared between the previous values. 5 band resistorsĥ band resistors are now more popular that the four band types. Theses resistors weren’t the most accurate and were manufactured to be around twenty percent tolerance. They are basically like the four band resistors but without the four tolerance band. The first colour is the first digit the second colour is the second digit and the third is the multiplier. Not very common anymore, in fact so uncommon I can’t find one to take a picture of, but you may come across 3 band resistors. That’s 100,000 ohms which is also known a 100 kilo ohm or 100k. So putting it together we have a 1 0 0000. The third stripe is yellow, which is 4 so there are four zero’s. The second stripe is black, which is 0 so the second digit is 0.
So according to the formula the resistance will be: 152 * 1 = 152 Ohms with 5% tolerance.The first strip is brown, which is 1 so the first digit is 1. Let’s take an example of a 5-band resistor with the colors given in the above image (brown, green, red, black and gold). ‘ e’ represents the 5 th significant digit, which is the fifth band color of resistor and this is the tolerance value of resistor. ‘ d’ represents the 4 th significant digit, which is the fourth band color of resistor and this is the multiplier value used in formula. ‘ c’ represents the 3 rd significant digit, which is the third band color of resistor. ‘ b’ represents the 2 nd significant digit, which is the second band color of resistor. ‘ a’ represents the 1 st significant digit, which is the first band color of resistor.
Just have a look to the resistor color code chart below and see the calculations, how the resistance value is calculated according to this chart.Ĭalculating resistance for a 5-band resistor To calculate the resistance of a resistor, you can select the appropriate color bands in the above resistor color code calculator. A resistor is identified by its pattern of color of bands.
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