In electronic circuits, resistors are used to reduce the flow of current through the circuit, they are also used to perform the following operations: We define a resistor as a passive two-terminal electrical component that is used as an electrical resistance viz: an element of the circuit. Now, to calculate the minimum and maximum resistance values, we need to multiply the resistance value by the tolerance percentage to obtain the following values: The fourth band, i.e., gold indicates the tolerance of ±5% (as given in table a). So, the minimum value is 750 kΩ or 75 10⁴ Ω. So the multiplication will be: 75 x 10000 = 750000 Ω Now, we will multiply that number by the multiplier indicated with the third band, i.e., yellow and it has the value of 10⁴ or 10000. The first two colors in the four-band resistor, viz: violet and green indicate the significant digits (i.e., 75) which are according to the above table (a). Let's suppose that we take a four-band resistor with the following band colors: If the nominal value was 34 Ohm and the 4th band of the resistor was gold (5%) the value range would be nominal +/- 5% = 32.3 to 35.Now, let’s discuss the resistor color coding formula:įor calculating the resistance colour code calculator, we need to group the values of the significant digits bands it means we will take the values of the first two or three bands from the left, depending on the total number of bands, then we will multiply that value by the multiplier to get the resistance value of the resistor. The color code for tolerance is as follows:Īn example calculating the range of a resistor value is: The fourth band is the tolerance and represents the worst case variation one might expect from the nominal value. The 3rd band or multiplier band is color coded as follows: The first 2 bands make up the significant digits where: The first 4 bands make up the resistance nominal value. There are three common types: 4 band, 5 band, and 6 band resistors. The number of bands is important because the decoding changes based upon the number of color bands. Resistors come in many shapes and sizes this tool is used to decode information for color banded axial lead resistors. A resistor is a perhaps the most common building block used in circuits.

Resistor code calculator