![]() ![]() But in order to do this the actual resistor needs to have some form of resistive or. There are many different types of Resistor available which can be used in both electrical and electronic circuits to control the flow of current or to produce a voltage drop in many different ways. Resistor color code series#Standard Resistor Value Series and Tolerances Resistor color codes Resistor color codes. The earliest examples of color codes in use are. Resistor color code code#Resistors produced by different manufacturers are compatible for the same designs because of the use of standard values. A Resistor colour code or Resistor Color Code is a system for displaying information by using different colors. This helps the supplier with stocking different values. ![]() The purpose of this was so that when companies produce resistors with different values of resistance, they would equally space on a logarithmic scale. Capactors, Zener diodes, and inductors also use these standards. These are referred to as preferred values or E-series, published in standard IEC 60063:1963. To make mass manufacturing of resistors easier, the IEC (International Electrotechnical Commision) defined tolerance and resistance values for resistors in 1952. Orange-Orange-Black-Brown-Violet Color CodeĪ resistor colored Orange-Orange-Black-Brown-Violet would be 3.3 kΩ with a tolerance of +/- 0.1%.Ī resistor colored Brown-Green-Grey-Silver-Red would be 1.58 Ω with a tolerance of +/- 2%.Ī resistor colored Blue-Brown-Green-Silver-Blue would be 6.15 Ω with a tolerance of +/- 0.25%. When you see only three color bands on a resistor, you know that it is actually a 4-band code with a blank (20%) tolerance band. The blank (20%) “band” is only used with the “4-band” code (3 colored bands + a blank “band”).Ī resistor colored Yellow-Violet-Orange-Gold would be 47 kΩ with a tolerance of +/- 5%.Ī resistor colored Green-Red-Gold-Silver would be 5.2 Ω with a tolerance of +/- 10%.Ī resistor colored White-Violet-Black would be 97 Ω with a tolerance of +/- 20%. All 5-band resistors use a colored tolerance band. It takes only a few seconds to check a resistor's ohmic value.The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only. If the component turns out defective or mislabeled, you can prevent potential future troubles by following this precaution. If the resistor lacks a fifth band, it tells you that the resistor might deviate by more than ☑% of the rated value after the first 1000 hours of use.Ī competent engineer or technician always tests a resistor with an ohmmeter before installing it in a circuit. A brown band indicates a maximum change of ☑% of the rated value. The fifth band, if any, indicates the maximum percentage by which you should expect the resistance to change after the first 1000 hours of use. If no fourth band exists, then the tolerance is ☒0%. B-1 or B-2), then that mark tells you the tolerance. ![]() If a resistor has a fourth colored band on its surface (#4 as shown in Figs. This sequence tells you that the resistor is rated at 68,000 ohms, or 68 k. A 330 Ohm resistor can be identified via resistor color codes of Orange-Orange-Brown-Gold or Orange-Orange-Black-Black-Gold. You refer to Table B-1 and determine that: You conclude that the rated resistance equals 4700 ohms, or 4.7 k.Īs another example, suppose you find a resistor with bands of blue, gray, and orange. You can read as follows, from left to right, referring to the table: For the first two bands, find that colors corresponding digit. Suppose that you find a resistor with three bands: yellow, violet, and red, in that order. When decoding the resistor color bands, consult a resistor color code table like the one below. Digital electronics and functional circuits Show more Show less.Diodes, transistors, op amps, and logic gates.Switches, relays, conductors, and cables. ![]()
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