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100 ohm resistor color code can be found using the resistor color chart, below image showing a resistor color code of 100R 4-band resistor:

       [Brown, Black, Brown, Gold]

The color code for the four bands 100 Ohm resistor is brown, black, brown, gold.

Band	Color	Value
Brown		1 (1st digit)
Black		0 (2nd digit)
Brown		10 multiplier
Gold		5% tolerance

4-band 100 ohm resistor color code is calculated as:

• 1st-band= Brown= 1 (1st digit)
• 2nd-band= Black= 0 (2nd digit)
• 3rd-band= Brown= 1 (multiplier) = 10^1 = 10
• 4th-band= Gold= ±5% (tolerance)

Thus, 100×1±5% –> 100 ohms  –> 100 Ω
The tolerance will be –> 5% of 100 –>5 Ω
Theoretically, the value of 100 Ω resistor is between 95 Ω to 105 Ω

Description: From the chart below we got the color code of resistor with respect to the decimal value of the respective band taken from left to right.
So for 100-ohm resistor, 1st digit is ‘ 1 ‘, ∴ look for color in chart having value 1, then it’s your 1st color(say brown). The next 2nd digit is ‘ 0 ‘, ∴ look for color in chart having value 0, then it’s your 2nd color (say black). Next 3rd digit ‘0’ (but value 10^1 = 10) is multiplier  ‘ 1 ‘, ∴ look for color in chart having value 1, then it’s your 3rd color (say brown).

• The last band in 4 and 5-bands resistors is the indicator of tolerance value of the resistor.
  In this case, it is Gold which indicates a 5% tolerance value.
  For Silver, it is 10%, and 2% tolerance is indicated by Brown. If the 4th band is absent it should be considered as 20% tolerance.

Image showing 100 ohm resistor color code of 5-band resistor:

     [Brown, Black, Black, Black, Gold]

The 100R 5-band resistor color code is brown, black, black, black, gold and it is found as:

• 1st-band = Brown= 1 (1st-digit)
• 2nd-band = Black= 0 (2nd-digit)
• 3rd-band = Black = 0 (3rd-digit)
• 4th-band = Black = 0 (multiplier) = 10^0 = 1
• 5th-band = Gold= ±5% (tolerance)

Description:

So for 100-ohm 5 band resistance,

The 1st digit is ‘ 1 ‘, ∴ look for color in chart having value 1, then it’s your 1st color(say brown).
The next 2nd digit is ‘ 0 ‘, ∴ look for color in chart having value 0, then it is 2nd band color (say black).
3rd digit is ‘ 0 ‘, ∴ look for color in chart having value 0, then it is 3rd band color (say black).
Now, 4th digit is multiplier value (10^0 = 1) which is zero, therefore, 4th band will be of black color.

Everything will be the same from the value to the power rating for 5-band resistor and 4 band resistance except the bands painted on them.

Let’s Brush-up resistor color code table and method to find value:

Resistors are widely used and available in a variety of values and power ratings. The lower power resistors typically seen in circuits are marked with color-coded bands painted that give the resistance and the tolerance (i.e., the range of resistance value) as shown in the above figures.

• As pictured in the above 100-ohm resistor, the bands are grouped toward one end of the resistor.
  The color band nearest to one of the end is considered as the 1st digit of the value.
• The next band is the second digit, the third band is a third digit (in the case of 5 band resistor), the next band is the multiplier, and the last band is for determining tolerance value.The values associated with the various band colors are shown:

For example, a resistor code having colors yellow, violet, orange, and gold corresponds to a value of 47 × 1000 ± 5% Ohms.

Size of resistors:

Resistors also come in variable forms, which means its value can be varied by some means. If the variable resistor has two pins, it is called a rheostat. The more common and versatile type is with three pins called potentiometer or simply a “pot”.
You must select the proper power rating for a resistor whenever required. The power rating of common resistors is indicated by its size. Typical values in watts are 1/8, 1/4, 1/2, 1, 2, 5 watts and so on.

also read what is precision resistor

1M ohm resistor color code with 5% tolerance is as shown:

 1M ohm resistor color code:

Brown, Black, Green, Gold

Band	Color	Value
1st Brown		1
2nd Black		0
3rd Green		100000
4th Gold		5%}
	1st digit 1 2nd digit 0 3rd is multiplier: 10 to power 4	1 M Ohms tolerance 5%

1 Megaohm is calculated as:

1st band= Brown = 1(1st digit)

2nd band= Black = 0(2nd digit)

3rd band= Green = 5(multiplier)

4th band= Gold= ±5% (tolerance)

∴ 10×1000000±5% ==> 1000000Ω  ==> 1MΩ

Tolerance  value  ==> 5% of 1M ==>5000Ω

Final assumed value of 1MΩ resistor is between 995 kΩ to 1005 kΩ

Other methods:

Remove the resistor from the Circuit PCB then test it with a digital multimeter in resistor mode and note down its value. It needs to be separated from board so as to avoid the equivalent resistance from parallel resistors in the circuit.
So, 1 megaohm resistor color code  is brown-black-green-gold

also check 330 ohm resistor color code

If you are searching for the value of SMD resistor code 151 value then take a look at the image.

Surface-mount resistors, in general, have 3 types of code marks on it.

• 3-digit-SMD  resistor coding system.
• 4-digit-SMD resistors coding sys,
• EIA96-SMD resistor coding sys.

A surface mount device with 151 code shown below with code:

The formulae to calculate the value of SMD resistor code of 3-digit,

Lets the digit on smd  be XYZ then,
The left 2 digits in the code showing the significant digits, and the third at the right side is a multiplier digit. This system is same as the resistor color code used in cylindrical carbon type large size. Here, simple decimal numbers are used in lieu of colors.

The value of SMD resistor code 151 is 150 ohms. Check why?

For calculating smd resistor code 151,

Here, X = 1 (1st digit in the code)
Y = 5 (2nd digit)
Z = 1 (3rd multiplier digit)

151 → 15 × 10¹ Ω
→ 15 × 10 Ω
→ 150 Ω 

So, it is a 150 Ω resistor code 151 smd resistor. By scanning these three-digit code you can not infer the power ratings of a resistor so you have to refer the datasheet by the part supplier. The surface mount device size depends primarily on the specified power ratings.

check 150 ohm resistor color code

500 ohm resistor color code is not available because the 500 ohm resistor is a nonstandard value of resistor:

• You do not need to worry about it, just use 510 ohm resistor instead. Because the nearest standard value (to the 500-ohm resistor) is 510 Ohm. 
• The error percent is only 2%, therefore, you can substitute 500 ohm with 510 ohm resistor and circuit performance will nearly remain same.

The alternative method is to connect two 1000 ohm resistor in parallel ie., 1 kΩ || 1 kΩ = 500 Ω

You have to make sure that the resistor you use while using any type of combination should be a precision resistors or it can of 5% tolerance level.

510 ohm instead of 500 Ohm Resistor color code:

{Green, Brown , Brown, Gold]

Band	Color	Value
1st Green		5
2nd Brown		1
3rd Brown		10
4th Gold		5%
	1st digit 5 2nd digit 1 3rd multiplier 10	510 Ohms tolerance +- 5%

It is calculated as:

1st band= Green= 5(1st digit)

2nd band= Brown= 1(2nd digit)

3rd band= Brown= 10(multiplier)

4th band= Gold= ±5% (tolerance)

Therefore, 51×10±5% ==> 510Ω  ==> 0.51 kΩ

And tolerance considered as ==> 5% of 510 ==>22.5 Ω

Final practical value of 510Ω resistor lies between 487.5 to 532.5 Ω

With these above two methods, you can get 500 Ohm Resistor replacement for your circuit.

{Bonus tip: You can order for customized resistors which can have nonstandard values, for manufacturing but in large scale, few manufacturing companies do so. This means that you can buy 500 ohm resistor though some customized component seller}

If you are looking for the value of SMD resistor code 104  in ohms then you can check image using with code shown below.

The value of SMD resistor code 104 is 100k ohms. Check why?

A surface mount device with 104 code shown below with code:

Lets the digits on smd resistor be XYZ then, the formula to calculate the value of smd resistor code of 3-digit,

The first 2-digit in this code shows the significant digits, and the third one at the right most end is a multiplier digit. This system is same to the resistors colour codes used in cylindrical carbon resistors of bigger size. Here, simply decimal numbers system are used instead of colors.

For calculating smd resistor code 104,

Here, X = 1 (1st digit in the code)
Y = 0 (2nd digit)
Z = 4 (3rd multiplier digit)

104 → 10 × 10⁴ Ω
→ 10 × 10000Ω
→ 100 kΩ 

So, it is a 100 kΩ resistor code 104 smd resistor. Checking this three-digit code you can not infer the power ratings (in watts) of a resistor so you have to check the datasheets provided by the part manufacturer/ supplier. The SMD device size depends wholely on the specified power ratings.

SMD resistors, in general, have 3/4 digit code on it. There is 3 coding system for smd resistance:

• 3-digit SMD  resistor system of coding.
• 4-digit SMD resistor  system “
• EIA96 SMD resistor system “

also check 100k ohm resistor color code

If you are searching for the value of SMD resistor code 105 value then you can check image using with code shown below.

Now,
SMD resistors, in general, have marks on it. There is 3 coding system for smd resistance:

• 3 digits SMD  resistor coding system.
• 4-digit SMD resistors coding system
• EIA96 SMD resistors coding sys.

A surface mount device with 105 code shown below with code:

The formulae to calculate the value of smd resistor code of 3-digit,

Lets the digits on smd resistor be XYZ then,
The first 2 digit in the code showing the significant digits, and the third at the right end is a multiplier digit. This system is same to the resistor colour code used in cylindrical carbon resistor large size you knew. Here, simply decimal numbers are used instead of colors.

For calculating smd resistor code 105,

Here, X = 1 (1st digit in the code)
Y = 0 (2nd digit)
Z = 5 (3rd multiplier digit )

105 → 10 × 10⁵ Ω
→ 10 × 100000Ω
→ 1 MΩ 

So, it is a 1MΩ resistor code 105 smd resistor. Checking this three-digit code you can not infer the power ratings of a resistor so you have to refer the datasheet by the part manufacturer/ supplier. The SMD device size depends primarily on the specified power ratings.

also check smd resistor code 100

If you are looking for the value of SMD resistor code 100 in ohms then you can check image along with code below.

The value of SMD resistor code 100 is 10 Ohms. Check why?

Now,
SMD resistors generally have markings on it. There are 3 coding system of smd resistance:

• 3 digits SMD  resistor coding system.
• 4 digits SMD resistor coding sys.
• EIA96 SMD resistors coding sys.

The surface mount device shown below with code 100:

Lets the code on smd resistor be XYZ then, the usual formula to calculate the value of surface mount resistor code,

The first 2 digit in the code specifies the significant digits, and the third one is a multiplier digit. This system is same as that of the resistor colour code used in cylindrical carbon resistor large size we use. Here simply numbers are used instead of colors.

For calculating smd resistor code 100,

Here, X = 1 (1st digit in the code)
Y = 0 (2nd digit)
Z = 0 (3rd multiplier digit in the code)

100 → 10 × 10⁰ Ω
→ 10 × 1Ω
→ 10Ω 

So, it is a 10Ω resistor code 100 smd resistor. Checking this three-digit code you can not guess the power ratings of a resistor so you have to refer the datasheet by the part manufacturer/ supplier. The SMD device size depends primarily on the specified power ratings.

If you are looking for the value of SMD resistor code 101 in Ohms then you should check images along with its notation below.

The value of SMD resistor code 101 is 100 ohms. Check why?

Now,
SMD resistors generally have markings on it. There are three coding systems for smd resistance:

• 3 digit SMD resistor coding sys.
• 4 digit SMD resistor coding sys.
• EIA96 SMD resistor coding sys.

The surface mount device shown below with code 101:

Lets the code on smd resistor be XYZ.
Then, the usual formula to calculate the value of smd resistor code of 3-digit,
 XYZ → XY * 10^Z 
         → XY * 10^Z Ω 
The first 2 digit in the code specifies the significant digits, and the third one is a multiplier digit. This system is same as that of the resistor colour code used in cylindrical carbon resistor large size we use. Here simply numbers are used instead of colors.

For calculating smd resistor code 101,

Here, X = 1 (1st digit)
Y = 0 (2nd digit)
Z = 1 (3rd multiplier digit)

101 → 10 × 10Ω
→ 10 × 10¹ Ω
→ 100Ω 

So, it is a 100Ω resistor code 101 smd resistor. By looking at this three-digit code you can not guess the power ratings of a resistor so you have to refer the datasheet by the part manufacturer/ supplier. The SMD device size depends primarily on the specified power rating we will be discussing it in next post.

If you are looking for the value in ohm of smd resistor code 103 then you should refer images along with its notations below.
SMD resistors generally have markings on it. There are three coding systems for smd resistor:

• 3 digit SMD resistor coding system
• 4 digit SMD resistor coding system
• EIA96 SMD resistor coding system

The 3 digits general-purpose SMD shown below with code:

Lets the code printed on smd resistor be XYZ.
The general formula to calculate the value of smd resistor code of 3-digit in ohms,

XYZ → XY × 10^Z 
         → XY × 10^Z Ω

The first two digit in the code indicate the significant digits. And the 3rd one is a multiplier digit. This system is same as that of the resistor color code used in cylindrical carbon resistor large size we use. Here just numbers are used instead of colors.

For calculating smd resistor code 103,

Here, X = 1 (1st digit)
Y = 0 (2nd digit)
Z = 3 (3rd multiplier digit)

103 → 10 × 1000Ω
→ 10 × 10³ Ω
→ 10kΩ 

So, it is a 10k smd resistor. By looking at this 3 digit code you can not guess the power rating of a resistor so you have to refer the datasheet by the component manufacturer/ provider.