# 微信抢红包扫雷小程序

Band 1Band 2Band 3Band 3Band 4Band 6
Color1st2nd3rdMultiplierToleranceTCR (10-6/K)
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
Pink
Standard:

this calculator will help you identify the value, tolerance and temperature coefficient of a color coded resistor by simply selecting the bands colors. it will also calculate the minimum and maximum values based on the tolerance ratio. this calculator supports resistors with 3, 4, 5, and 6 bands.

## How to use?

to use the calculator, follow these easy steps:

1. Select the number of bands on the resistor you are trying to identify.
2. For each band, select the matching color in the table column indicating the band number.
3. The resistance value will be calculated and shown along with the minimum and maximum values.

## Resistor Color-coding

color-coding is a method used to indicate the resistive value, tolerance, and temperature coefficient of resistors with low wattage rating because of their small size. color bands are used because they can be easily and cheaply printed on a small electronic component. color-coding is also used for capacitors, inductors and diodes.

when the resistor body surface is large enough, as in large wattage resistors, the resistance value, tolerance, and wattage are usually printed on the body of the resistor. surface mounted resistors (smd) use another coding system that uses alphanumeric codes printed on its surface instead of color codes.

the coding is defined in the international standard . it describes the coding standard for both resistors and capacitors.

in a three-band resistor, the first two bands represent the first two significant digits followed by one band for the multiplier. since no tolerance band is available, the tolerance will always be ±20%.

in a five-band resistor, the first three bands represent the first three significant digits. the fourth band represents the multiplier. the fifth band represents the tolerance.

in a six-band resistor, the first five bands have the same representation as a five-band resistor followed by one extra sixth band that represents the temperature coefficient of resistance (tcr).

## Tolerance

tolerance is the percentage of error between the actual measured resistive value and the stated value. this is due to the manufacturing process and it is expressed as a percentage of its preferred value

## Calculating

Let's take for example a four-band resistor with the following band colors: Violet Green Yellow Gold

Since it is a four-band resistor, the first two bands (violet and green) will indicate the significant digits which are, according to the table above; 75.

We then multiply that number by the multiplier indicated with the 3rd band (yellow) which has the value of; x104 = 10000.
The result of the multiplication will be: 75 x 10000 = 750000Ω = 750kΩ.

The fourth band (gold) will indicate the tolerance which in our example is: ±5%
To calculate the minimum and maximum resistance values, we multiply the resistance value by the tolerance percentage to come up with the following values:
Minimum = 750000 - (750000 x 5/100) = 750000 - 37500 = 712500 = 712.5kΩ

## Exceptions

a zero-ohm resistor is a resistor having a single black band. its resistance is approximately zero and it is used to connect two traces on a printed circuit board (pcb). is it used in automated pcb assembly where using the same equipment used to mount other resistors is easier than using a separate machine to install a wire jumper.

resistors manufactured for military use, may include an additional band indicating the failure rate.

## Other Resources

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