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Resistors, Resistor Color Codes, Resistor Color Code Calculator

Resistors, like diodes and relays, are another of the electronic parts that should have a section in the installer's parts bin. They have become a necessity for the mobile electronics installer, whether it be for door locks, parking lights, timing circuits, remote starts, LED's, or just to discharge a stiffening capacitor.

Resistors "resist" the flow of electrical current. The higher the value of resistance (measured in ohms) the lower the current will be.

Resistors are color coded. To read the color code of a common 4 band 1K ohm resistor with a 5% tolerance, start at the opposite side of the GOLD tolerance band and read from left to right. Write down the corresponding number from the color chart below for the 1st color band (BROWN). To the right of that number, write the corresponding number for the 2nd band (BLACK) . Now multiply that number (you should have 10) by the corresponding multiplier number of the 3rd band (RED)(100). Your answer will be 1000 or 1K. It's that easy.

* If a resistor has 5 color bands, write the corresponding number of the 3rd band to the right of the 2nd before you multiply by the corresponding number of the multiplier band. If you only have 4 color bands that include a tolerance band, ignore this column and go straight to the multiplier.

1K Resistor
The tolerance band is usually gold or silver, but some may have none. Because resistors are not the exact value as indicated by the color bands, manufactures have included a tolorance color band to indicate the accuracy of the resistor. Gold band indicates the resistor is within 5% of what is indicated. Silver = 10% and None = 20%. Others are shown in the chart below. The 1K ohm resistor (pictured), may have an actual measurement any where from 950 ohms to 1050 ohms.

If a resistor does not have a tolerance band, start from the band closest to a lead. This will be the 1st band. If you are unable to read the color bands, then you'll have to use your multimeter. Be sure to zero it out first!
top of page Resistor Color Codes
Band Color 1st Band # 2nd Band # *3rd Band # Multiplier x  Tolerances  ± %
Black 0 0 0 1  
Brown 1 1 1 10     ± 1%
Red 2 2 2 100     ± 2 %
Orange 3 3 3 1000  
Yellow 4 4 4 10,000  
Green 5 5 5 100,000     ± 0.5 %
Blue 6 6 6 1,000,000     ± 0.25 %
Violet 7 7 7 10,000,000     ± 0.10 %
Grey 8 8 8 100,000,000     ± 0.05 %
White 9 9 9 1,000,000,000  
Gold 0.1     ± 5 %
Silver 0.01     ± 10 %
None     ± 20 %

top of page Resistor Color Code Calculator
Below is a JavaScript apllication for determining resistor values, courtesy of Danny Goodman. Just select the color for each band and the value will automatically be displayed. Please note, this is for 4 band resistors only. Note: May not work in some older versions of Opera.
GRAPHICAL RESISTANCE CALCULATOR in JAVASCRIPT Version 2.0
by Danny Goodman (dannyg@dannyg.com)
This program is Copyright 1996 by Danny Goodman.
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment

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Wednesday, January 18, 2017 • Copyright © 1999-2017 the12volt.com Donate to the12volt.com Advertising Top of Page
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.
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