In order to calculate the correct value of resistance, the following method is used in a color code system : The resistor color 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.īy matching the color of the first band with its associated number in the digit column of the color chart below the first digit is identified and this represents the first digit of the resistance value.Īgain, by matching the color of the second band with its associated number in the digit column of the color chart we get the second digit of the resistance value and so on. It consists of a set of individual colored rings or bands in spectral order representing each digit of the resistors value. This is an international and universally accepted method, developed many years ago as a simple and quick way of identifying a resistors ohmic value no matter what its size or condition. Since the average resistor is too small to have the value printed on it, the resistance value is displayed using the color code ( the colored bars/the colored stripes ). For example, the values 1, 2.2, 4.7 and 10 are used in a typical situation. The resistance value is a discrete value.
In our previous post we saw that there are many different types of Resistor available that can be used in both electrical and electronic circuits.