The first three bands represent the significant digits, the fourth is the multiplier, and the fifth is the tolerance. Charles Renard proposed these numbers and have since been adopted in the international standard ISO 3.ĥ-band axial resistors ĥ-band identification is used for higher precision (lower tolerance) resistors (1%, 0.5%, 0.25%, 0.1%), to notate the extra digit. These numbers are not chosen at random, but are part of IEC 60063. As soon as the E48 series, the resistors contain 3 significant digits, so a code with 5 color rings.
The E24 series therefore contains 24 values with 2 significant digits. To help you remember them, the standard values for 10% resistors are: This is useful because the digits, and hence the first two or three stripes, will always be similar patterns of colors, which you will learn to recognize without checking a chart. These values repeat for every exponent, 6.8, 68, 680. Resistors use specific values, which are determined by their tolerance. Note that red to violet are the colors of the rainbow where red is low energy and violet is higher energy. The tolerance for a 4-band resistor will be 2%, 5%, or 10%įor example, if you are looking for a 12K (12000 ohm) resistor with ±5% tolerance, you would be looking for a Brown (1) Red (2) Orange (×10 3) Gold (±5%) resistor. Each color corresponds to a certain number, shown in the chart below. The scheme is simple: The first two numbers are the first two significant digits of the resistance value, the third is a multiplier, and the fourth is the tolerance of the value. The values are part of the preferred numbers. The best-known series with 4 rings is called the E12 serie because this series contains 12 values. The values of the resistors belong to series. It consists of four colored bands that are painted around the body of the resistor. Four band identification is the most commonly used color coding scheme on all resistors. Cases are usually brown, blue, or green, though other colors are occasionally found like dark red or dark gray.Ĥ-band axial resistors Īxial resistors are also called "thru-hole" resistors because they cross the plate to which they are welded. Most axial resistors use a pattern of colored stripes to indicate resistance.
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