How to calculate value of resistor from color code

How to calculate value of resistor from color code

How to calculate value of resistor from color code

Resistors are small electric components, utilized in numerous electric and digital circuits to limit the go-with drift of contemporary withinside the circuit and additionally to regenerate voltage drop in numerous ways. These are to be had in unique sizes and shapes. Each resistor consists of a resistance or resistive cost that degrees from ohms to milliohms. How to calculate value of resistor from color code

 So those values may be measured by resistor color code thru the color band concept. For every small component, a color code is used to signify the resistance cost in preference to revealed text. So those trendy colors specify the score, cost & tolerance. This article discusses what’s a resistor color code and the way to examine it with examples

What is a Resistor Color Code?

These color bands of the resistor are known as resistor color codes. Each resistor has unique color bands on it that denote the electric resistance. This turned into invented via way of means of the RMA (Radio Manufacturers Association) withinside the yr the 1920s.

The energy score of all of the resistors may be marked with color bands that rage up to at least one watt. The color bands at the resistor special resistance cost, price of tolerance & on occasion failure rates, or reliability. The resistor color bands vary from three to six wherein the primary bands specify the cost of resistance & the 1/3 band is a multiplier.

How to Read Resistor Color Code?

The following chart is used to discover the resistance cost of the resistor in conjunction with tolerance. The following desk allows specifying the band colors as soon as the values are recognized. A computerized resistor color code calculator also can be used to decide the resistance values very quickly. The resistor color coding method is “BB ROY of Great Britain has a superb wife” which denotes the alphabet of BBROYGBVGW. This code stands for diverse colors just like the following

B for Black

B for Brown

R for Red

O for Orange

Y for Yellow

G for Green

B for Blue

V for Violet

G for Grey

W for White

Band Colors    1s Digit            second Digit    third Digit         Multiplier          Tolerance       

Temperature Coefficient

Black   zero     zero     zero     1 Ohm             250 ppm/K

Brown  1          1          1          10 Ohm           ±1% % one hundred ppm/K

Red     2          2          2          one hundred Ohm       ±2% % 50 ppm/K

Orange            three    three    three    1 ok Ohm                    15 ppm/K

Yellow four      four      four      10 ok Ohm      ±zero.five%     25 ppm/K

Blue     five      five      five      one hundred ok Ohm  ±1%     20 ppm/K

Green  6          6          6          1 M Ohm         ± zero.1%        10 ppm/K

Violet   7          7          7                                  five ppm/K

Grey    8          8          8                                  1 ppm/K

White   nine     nine     nine                            

Gold zero.1 Ohm        ± five%           

Silver zero.01 Ohm     ±10%  

How to Calculate Resistor Color Code?

The 4-band resistor color code may be used to make fewer precision resistors consisting of tolerances of five%, 10% & 20%. There are a few easy regulations to perceive the resistor values. For example; withinside the four-band resistor, the primary colors denote the maximum vital digits for the cost of resistance. Each color band is assigned numbers from zero to nine and generally, those bands will decode unique numbers right into a major code.

For instance, in a 4-color band resistor, the primary color bands are brown & red, then the values may be 1 & 2. The third band specifies the multiplier (energy of 10) this means that the 2 large bits must be expanded thru the identical allotted cost for each color like in the sooner step ( if the band color is two then you want to multiply it via way of means of 2 so 10^2 = one hundred in any other case upload zeros. So, for the preceding example, the resistor cost might be 1200Ω or 1.2kΩ.

In the above example, if the multiplier band is silver or gold, the decimal factor may be shifted to the left thru one in any other case places Next, the tolerance cost and color are allotted to each tolerance. For gold tolerance, it’s far ± five%, and for silver, it’s far ± 10%.

Resistance Tolerance

Tolerance may be described as the mistake percent withinside the resistance cost. So, it’s far how tons we may be looking forward to for a real dimension of the resistor. For example, if the tolerance = five%, then we will count on five% of extra de withinside the resistance cost. Identically, if the tolerance is underneath 2% inside a resistor, then this sort of resistor is known as a precision resistor. If the resistor doesn`t have tolerance then we ought to take it as ±20%.

Temperature Coefficient

The temperature coefficient is the 6th color band of the resistor. So, it may be described because of the extra inside resistance for every one Kelvin extra de withinside the temperature. If the temperature of the resistor modifications with 1 Kelvin & the sixth band at the resistor is black, then there may be an alteration of 250 elements for every million inside resistors. So, this band is likewise installed withinside the resistors with excessive accuracy.

In 6 band color resistor, every band denotes just like the following.

1st color band is the primary large digit

the second color band is the second large digit

The third Color Band is the 1/3 large digit

4th color band is a Multiplier with an energy of 10

the fifth color band is the tolerance

the sixth color band is the temperature coefficient of resistance


The resistance color code calculation for three, four, five & 6 bands resistors are mentioned underneath.

three Band Resistor Color Code

The resistor with three band color code is proven underneath. In a 3-band resistor color code, the primary bands denote the resistance values and the 1/3 band is a 1-multiplier band. Generally, the tolerance for the 3-band resistor is ±20% which means that no tolerance strip.

In the subsequent 3-band resistor, the primary color is brown-2, the second color is black-zero and the 1/3 color is red (multiplier) The method for the 3-band resistor color code is – 1st digit. second digit x Multiplier

= 1.0X100 = 1000 ±20%

The resistor with four band color Printed circuit board in china code is proven underneath. In the 4-band resistor color code, the primary bands denote the resistance values, 1-multiplier band & 1-tolerance band.

In the subsequent 4-band resistor, the primary color is brown-2, the second color is black-zero, and the 1/3 color is red (multiplier) The method for the 3-band resistor color code is – 1st digit. second digit. third digit x Multiplier

= = 1000 ±five%

The resistor with five band color code is proven underneath. In 5 band resistor color code, the primary 3 bands denote the

Leave a Reply