How to Read Color Codes From Resistors.

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The value of the resistor is marked on the body using colors. Every color is different number and you can remember these numbers or you can just use the table on next step. OR there are much resistor calculators that you can use. It's for the laziest people :D .  However it's your decision ,and I will show you all ways to calculate resistor value.

Colors

Here is the table with the colors and numbers. As you can see they are:
  • BLACK:     0
  • BROWN:   1
  • RED:           2
  • ORANGE:   3
  • YELLOW:   4
  • GREEN:       5
  • BLUE:          6
  • VIOLET:      7
  • GREY:          8
  • WHITE:        9
But this is not for all colors. From right to left the second color is multiplier. Digits from the first colors must be multiplied with the number of this color.
  • BLACK:     1
  • BROWN:   10
  • RED:           100
  • ORANGE:   1000
  • YELLOW:   10000
  • GREEN:       100000
  • BLUE:          1000000
  • GOLD:          0.1
  • SILVER:       0.01
And the last color: This is tolerance. Tolerance is the precision of the resistor and it is given as a percentage. For example a 390 resistor with a tolerance of ±10% will have a value within 10% of 390, between 390 - 39 = 351 and 390 + 39 = 429 (39 is 10% of 390).
  • BROWN:   1%
  • RED:           2%
  • GOLD:        5%
  • SILVER:     10%
  • NOTHING:  20%

Calculator

Resistor color code calculator
If you are too lazy to think about colors and digits and mat ... this is for you :) :D

Examples

Exemple: If first color is RED ,second is RED ,third is BLACK and the last is SILVER it means:
RED - 2  --  RED - 2  --  YELLOW - x10000  --  SILVER - 10%          so...
2   2   0000 +/- 10% * 2 2 0000   so... :D
220000 +/- 22000
This is 220 000 Ohm or 220 kOhm
or 220 000 - 22 000 Ohm or 220 - 22 kOhm
or 220 000 + 22 000 Ohm or 220 + 22 kOhm

Hope you got it :)

Exercises

Now some exercises :)
Try to calculate resistors' values from third and forth picture.
Answers are below.




Answers






The first one is        :  11000  =   11k ohms
The second one is :  1000    =    1k ohms
The both are with gold color for the tolerance ,it means 5%.

It's your answer? I hope so :)

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22 Discussions

In your example you give the color code -(red, red, black, silver)-

"it means: RED = 2, RED = 2, YELLOW=(x10000), SILVER = 10%"

Shouldn’t it be: red = 2, red = 2, BLACK = (x1), silver = +/-10%

22*1 = 22+/-10%

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plesperance

2 years ago

Anyone know a reverse resistor calculator?

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cjjam

2 years ago

im just already highschool but i dont understand!

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cjjam

2 years ago

difficult!

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JLoPhysics

2 years ago

You mention that you read from left to right - but if you flip the resistor over, these directions are reveresed. How do I know which side is 'left' on a resistor?

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ivan.toopiJLoPhysics

Reply 2 years ago

The band with the metallic paint (Gold Silver etc.etc), is the 'right side' All other banding generally is done in block colour (Standardized colours used in electronics)

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J-FiveJLoPhysics

Reply 2 years ago

It's the closest band to end of the resistor.

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TanjotPJLoPhysics

Reply 2 years ago

Hey, I can answer that question for you, if you haven't found your answer quite yet. The tolerance band should be on the far right when you are looking at it. It could be Gold(5%) or Silver(10%). This means it should be xcolour, ycolour, zcolour and then your gold or silver tolerance band when you look at it. This way it is consistent and is facing the right way in order to measure the resistance when going to calculate it. As for putting your resistor in a circuit, well resistors are not polarized , therefore you can put them in any way. Good luck!

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plesperance

2 years ago

How do you know which end to decipher the color code.

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KevinJ96

2 years ago

This was so helpful. I had a booklet that tried to explain it, but chose the most difficult way to explain something that it turns out is really easy! Although, as pointed out already, your answers are switched. Made me double-check my answers though, so maybe not a bad thing!

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KayodeO1

2 years ago

Hi, I think the answers are switched

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MikeH130

2 years ago

The answers are switched. Using the tool provided, the first resistor is actually the second answer.

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SaryaT

3 years ago

how will be if you have given colour code indigo, red, red and gold

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SaryaT

3 years ago

how will be if you have given colour code indigo, red, red and gold

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alit3

3 years ago on Introduction

Thank you for information . you help me :-)