4 Band Resistor Calculator

Tools介紹
A resistor is perhaps the most common building block used in circuits. Resistors come in many shapes and sizes. This tool is used to decode information for color banded axial lead resistors.
4 BAND RESISTOR

##### Introduction

A resistor is a perhaps the most common building block used in circuits. Resistors come in many shapes and sizes this tool is used to decode information for color banded axial lead resistors.

##### 4 Band Description

The number of bands is important because the decoding changes based upon the number of color bands. There are three common types: 4 band, 5 band, and 6 band resistors. For the 4 band resistor:

Band 1 – First significant digit.

Band 2 – Second significant digit

Band 3 – Multiplier

Band 4 – Tolerance

##### Resistance Value

The first 4 bands make up the resistance nominal value. The first 2 bands make up the significant digits where:

black – 0

brown – 1

red – 2

orange – 3

yellow – 4

green – 5

blue – 6

violet – 7

grey – 8

white – 9

The 3rd band or multiplier band is color coded as follows:

black – x1

brown – x10

red – x100

orange – x1K

yellow – x10K

green – x100K

blue – x1M

violet – x10M

grey – x100M

white – x1G

gold – .1

silver – .01

An example of a resistance value is:

band 1 = orange = 3,

band 2 = yellow = 4,

band 3 = blue = 1M

value = 34*1M = 34 Mohm

##### Resistance Tolerance

The fourth band is the tolerance and represents the worst case variation one might expect from the nominal value. The color code for tolerance is as follows:

brown – 1%

red – 2%

orange – 3%

yellow – 4%

green – .5%

blue – .25%

violet – .1%

gray – .05%

gold – 5%

silver – 10%

An example calculating the range of a resistor value is:

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 35.7

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