Then the resistor colour code is read from left to right as illustrated below: The Standard Resistor Colour Code Chart By matching the colour of the first band with its associated number in the digit column of the colour chart below the first digit is identified and this represents the first digit of the resistance value.Īgain, by matching the colour of the second band with its associated number in the digit column of the colour chart we get the second digit of the resistance value and so on. The resistor colour code markings are always read one band at a time starting from the left to the right, with the larger width tolerance band oriented to the right side indicating its tolerance. It consists of a set of individual coloured rings or bands in spectral order representing each digit of the resistors value. These coloured painted bands produce a system of identification generally known as a Resistors Colour Code.Īn international and universally accepted resistor colour code scheme was developed many years ago as a simple and quick way of identifying a resistors ohmic value no matter what its size or condition. So to overcome this, small resistors use coloured painted bands to indicate both their resistive value and their tolerance with the physical size of the resistor indicating its wattage rating. But when the resistor is small such as a 1/4 watt carbon or film type, these specifications must be shown in some other manner as the print would be too small to read. The fourth band gives resistance tolerance.Its colour is either silver or gold.Silver band indicates a tolerance of ± 10 % ,a gold band shows a tolerance of ±5 %.If there is no fourth band ,tolerance is understand to be ± 20%.By tolerance ,means the posible variation from the marked value.For example ,a 1000 Ω resistor with a tolerance of ± 10 % will have an actual resistance anywhere between 900 Ω and 1100 Ω.Ĭertain precision resistors with tolerance of 2 %, 1 %, or less are generally color coded with five bands as shown in figure given below:īegin at the band closest to one end.The first band is the first digit of the resistance value,the second band is the second digit,the third band is the third digit,the fourth band is multiplier ( number of zeroes after the third digit),and the fifth indicates the percent tolerance.The resistance value, tolerance, and wattage rating are generally printed onto the body of the resistor as numbers or letters when the resistors body is big enough to read the print, such as large power resistors.The third band is decimal multiplier i.e,it gives the number of zeroes after the first two digits.The second band gives the second digit.
The first band indicates the first digit in the numerical value of the resistance.The 5 band resistor colour bands are interpreted as follows:
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