Resistor is a component with a specific resistance, used to control the current in a circuit. The unit of resistance is the Ohm, and the symbol for resistance is the Greek letter omega W.

 

How to read Resistor Color Codes?

 

Each color band (strip, ring etc.) is associated with a number as represented below:

 

Black=0, Brown=1, Red=2, Orange=3, Yellow=4, Green=5, Blue=6, Purple=7, Gray=8, White=9

  1. Find the tolerance color band, typically gold ( 5%) and sometimes silver (10%).

  2. Starting from the other end, identify the first color band and write down the number associated with that color as in the chart above.

  3. Identify the next color band and write down the number associated with that color.

  4. Identify the next color band and write down that number of zeros. The third band or '"multiplier" band indicates the number of zeros.

Please note:

  • If the "multiplier" color band is Gold move the decimal point one to the left. 

  • If the "multiplier" color band is Silver move the decimal point two places to the left. 

  • If the resistor has one more band past the tolerance band it is a quality band. In this case read the number as the % (percentage) failure rate per 1000 hours. This rating assumes full wattage being applied to the resistors. 

  • Finally 1% resistors have three bands to read digits to the left of the "multiplier". They have a different temperature coefficient in order to provide the 1% tolerance.

Example:

Green, Brown, Red, Gold (color bans left to right) 

  • Green=5, Brown=1 and Red the third ring multiplier is 2 (two zeros) we get resistor with value of 5100 Ohms or 5.1K Ohms.

  • The last color band indicates that this resistor has a tolerance of 5% therefore the resistor value can range from 4.845K Ohms to 5.355K Ohms.

Calculate Resistors connected in series:

 

RTotal = R1+R2+...RN

 

Calculate Resistors connected in parallel:

                           1

RTotal = 1/{(1/R1)+(1/R2)+...(1/RN)}

 

Description and SKU# Price 1-10 10-100 100-1K Picture

Resistor 18 Ohms .25W/5%

EID-R-025-018 

 

.12

 

.09

 

.05

 

Resistor 24.9 Ohms .25W/1%

EID-R-025-24X9-1 

 

1.20

 

.49

 

.25

 

Resistor 49.9 Ohms .25W/1%

EID-R-025-49X9-1 

 

1.20

 

.49

 

.25

 

Resistor 51 Ohms .25W/5%

EID-R-025-051 

 

.12

 

.09

 

.05

Resistor 82 Ohms .25W/5%

EID-R-025-082 

 

.12

 

.09

 

.05

Resistor 100 Ohms .25W/5%

EID-R-025-100 

 

.12

 

.09

 

.05

 

Resistor 150 Ohms .25W/5%

EID-R-025-150 

 

.12

 

.09

 

.05

 

Resistor 240 Ohms .25W/5%

EID-R-025-240 

 

.12

 

.09

 

.05

Resistor 249 Ohms .25W/1% 

EID-R-025-249-1

 

1.20

 

.49

 

.25

 

Resistor 330 Ohms .25W/5%

EID-R-025-330 

 

.12

 

.09

 

.05

 

Resistor 360 Ohms .25W/5%

EID-R-025-360 

 

.12

 

.09

 

.05

Resistor 470 Ohms .25W/5%

EID-R-025-470 

 

.12

 

.09

 

.05

 

Resistor 680 Ohms .25W/5% 

EID-R-025-680 

 

.12

 

.09

 

.05

Resistor 1K Ohms .25W/5%

EID-R-025-01K 

 

.12

 

.09

 

.05

Resistor 1.2K Ohms .25W/5% 

EID-R-025-1K2 

 

.12

 

.09

 

.05

Resistor 1.5K Ohms .25W/5% 

EID-R-025-1K5 

 

.12

 

.09

 

.05

Resistor 1.8K Ohms .25W/5% 

EID-R-025-1K8 

 

.12

 

.09

 

.05

 

Resistor 2K Ohms .25W/5% 

EID-R-025-02K 

 

.12

 

.09

 

.05

 

Resistor 2.2K Ohms .25W/5% 

EID-R-025-2K2 

 

.12

 

.09

 

.05

Resistor 2.4K Ohms .25W/5% 

EID-R-025-2K4 

 

.12

 

.09

 

.05

 

Resistor 3K Ohms .25W/5% 

EID-R-025-03K

 

.12

 

.09

 

.05

 

Resistor 3.3K Ohms .25W/5% 

EID-R-025-03K

 

.12

 

.09

 

.05

 

Resistor 3.65K Ohms .25W/1% 

EID-R-025-3K65-1

 

.50

 

.49

 

.25

 

Resistor 3.9K Ohms .25W/5% 

EID-R-025-3K9

 

.12

 

.09

 

.05

 

Resistor 4.7K Ohms .25W/5% 

EID-R-025-4K7 

 

.12

 

.09

 

.05

 

Resistor 5.1K Ohms .25W/5% 

EID-R-025-5K1 

 

.12

 

.09

 

.05

Resistor 6.2K Ohms .25W/5% 

EID-R-025-6K2 

 

.12

 

.09

 

.05

 

Resistor 6.8K Ohms .25W/5% 

EID-R-025-6K8 

 

.12

 

.09

 

.05

 

Resistor 7.5K Ohms .25W/5% 

EID-R-025-7K5 

 

.12

 

.09

 

.05

 

Resistor 8.2K Ohms .25W/5% 

EID-R-025-8K2 

 

.12

 

.09

 

.05

 

Resistor 10K Ohms .25W/5% 

EID-R-025-10K 

 

.12

 

.09

 

.05

 

Resistor 10K Ohms .25W/1% 

EID-R-025-10K-1 

 

.56

 

.45

 

.35

 

Resistor 12K Ohms .25W/5% 

EID-R-025-12K 

 

.12

 

.09

 

.05

 

Resistor 15K Ohms .25W/5% 

EID-R-025-15K 

 

.12

 

.09

 

.05

 

Resistor 18K Ohms .25W/5% 

EID-R-025-18K 

 

.12

 

.09

 

.05

 

Resistor 20K Ohms .25W/5% 

EID-R-025-20K 

 

.12

 

.09

 

.05

Resistor 22K Ohms .25W/5% 

EID-R-025-22K 

 

.12

 

.09

 

.05

 

Resistor 24K Ohms .25W/5% 

EID-R-025-24K 

 

.12

 

.09

 

.05

 

Resistor 27K Ohms .25W/5% 

EID-R-025-27K 

 

.12

 

.09

 

.05

Resistor 30K Ohms .25W/5% 

EID-R-025-30K 

 

.12

 

.09

 

.05

 

Resistor 33K Ohms .25W/5% 

EID-R-025-33K 

 

.12

 

.09

 

.05

Resistor 39K Ohms .25W/5% 

EID-R-025-39K 

 

.12

 

.09

 

.05

Resistor 47K Ohms .25W/5% 

EID-R-025-47K 

 

.12

 

.09

 

.05

 

Resistor 49.9K Ohms .25W/1% 

EID-R-025-49K9-1 

 

.76

 

.65

 

.55

 

Resistor 51K Ohms .25W/5% 

EID-R-025-51K 

 

.12

 

.09

 

.05

 

Resistor 56K Ohms .25W/5% 

EID-R-025-56K 

 

.12

 

.09

 

.05

Resistor 62K Ohms .25W/5% 

EID-R-025-62K 

 

.12

 

.09

 

.05

 

Resistor 75K Ohms .25W/5% 

EID-R-025-75K 

 

.12

 

.09

 

.05

 

Resistor 82K Ohms .25W/5% 

EID-R-025-82K 

 

.12

 

.09

 

.05

 

Resistor 91K Ohms .25W/5% 

EID-R-025-91K 

 

.12

 

.09

 

.05

 

Resistor 100K Ohms .25W/5%

EID-R-025-100K 

 

.12

 

.09

 

.05

Resistor 100K Ohms .25W/1%

EID-R-025-100K-1 

 

.120

 

.49

 

.25

 

Resistor 120K Ohms .25W/5%

EID-R-025-120K 

 

.12

 

.09

 

.05

 

Resistor 130K Ohms .25W/5%

EID-R-025-130K 

 

.12

 

.09

 

.05

 

Resistor 150K Ohms .25W/5%

EID-R-025-150K 

 

.12

 

.09

 

.05

 

Resistor 160K Ohms .25W/5%

EID-R-025-160K 

 

.12

 

.09

 

.05

 

Resistor 200K Ohms .25W/5%

EID-R-025-200K 

 

.12

 

.09

 

.05

 

Resistor 240K Ohms .25W/5%

EID-R-025-240K 

 

.12

 

.09

 

.05

 

Resistor 330K Ohms .25W/5%

EID-R-025-330K 

 

.12

 

.09

 

.05

 

Resistor 390K Ohms .25W/5%

EID-R-025-390K 

 

.12

 

.09

 

.05

 

Resistor 470K Ohms .25W/5%

EID-R-025-470K 

 

.12

 

.09

 

.05

 

Resistor 510K Ohms .25W/5%

EID-R-025-510K 

 

.12

 

.09

 

.05

 

Resistor 1M Ohms .25W/5% 

EID-R-025-01M 

 

.12

 

.09

 

.05

Resistor 2.7M Ohms .25W/5% 

EID-R-025-2M7 

 

.12

 

.09

 

.05

Resistor 10M Ohms .25W/5% 

EID-R-025-10M 

 

.12

 

.09

 

.05

Resistor 100K Ohms .25W/5% 

9Pins (pin 1 Common)

EID-R-S9P-100K 

 

 

.30

 

 

.27

 

 

.25

Resistor 100K Ohms .25W/5% 

16Pins (BUS)

EID-R-S9P-100K 

 

 

.79

 

 

.69

 

 

.59