Difference between revisions of "Resistor Color Codes"

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Latest revision as of 16:32, 19 February 2013

Introduction

The resistance value for a resistor is generally indicated through the use of a 4 (or 3, or 5) band color code. For a typical four-band code, the first two bands tell you the first two digits of the resistance, the third band tells you how many zeros to add, and the fourth band tells you the tolerance. For a five-band color code, the first three bands tell you the first three digits of the resistance, the fourth band tells you how many zeros to add, and the fifth band tells you the tolerance.

Digit, Multiplier, and Tolerance Band Chart

Color Color Name Digit band Multiplier band Tolerance band
Black 0 1
Brown 1 10 ± 1%
Red 2 100 ± 2 %
Orange 3 1000
Yellow 4 10,000
Green 5 100,000 ± 0.5 %
Blue 6 1,000,000 ± 0.25 %
Violet 7 10,000,000 ± 0.10 %
Gray 8 100,000,000 ± 0.05 %
White 9 1,000,000,000
Gold 0.1 ± 5 %
Silver 0.01 ± 10 %
None ± 20 %

Examples

Four-band Resistor

A resistor that has bands (starting from the band on the part of the resistor with the largest radius) of blue-gray-brown-gold will be:

\( \mbox{blue }\mbox{ gray }*\mbox{ brown }\pm\mbox{ gold} \)

resistor, or 68 * 10 = 680±5% Ω.

Five-band resistor

A yellow-violet-red-white-silver resistor would be:

\( \mbox{yellow }\mbox{ violet }\mbox{ red }*\mbox{ white } \pm \mbox{ silver } \)

or 472 * 1000000000 = 472±10\% GΩ.

Note that the same value resistor will have a different multiplier band color in the four-band scheme than in the five-band scheme. A 1 kΩ resistor will be brown-black-red-TOL in the first case and brown-black-black-brown-TOL in the second.

Questions

Post your questions by editing the discussion page of this article. Edit the page, then scroll to the bottom and add a question by putting in the characters *{{Q}}, followed by your question and finally your signature (with four tildes, i.e. ~~~~). Using the {{Q}} will automatically put the page in the category of pages with questions - other editors hoping to help out can then go to that category page to see where the questions are. See the page for Template:Q for details and examples.

External Links

References


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