Color        A       B       C       D       E       F      
silver


0.01

 + - 10%
gold


0.1

 + - 5%
black 0 0 0

1
brown 1 1 1

10

 + - 1%

100ppm
red 2 2 2

100

 + - 2%

50ppm
orange 3 3 3

1k

15ppm
yellow 4 4 4

10k

25ppm
green 5 5 5

100k

 + - 0.5%
blue 6 6 6

1M

 + - 0.25%
violet 7 7 7

10M

 + - 0.1%
grey 8 8 8
+ - 0.05%
white 9 9 9



4-band system      5-band system      6-band system     
A: first figure A: first figure A: first figure
B: second figure B: second figure B: second figure
D: multipier C: third figure C: third figure
E: tolerance D: multiplier D: multiplier

E: tolerance E: tolerance


F: temp. coeff.









Temperature Coefficient

The electrical resistance of a conductor is dependent upon collisional proccesses within the material. With increasing temperature the resistance will normally increase too.

The temperature coefficient of Copper is +0.393 percent per degree C (near room temperature): If the temperature increases 1 degree C the resistance will increase 0.393 percent.

0.3 percent per degree C equals '3300ppm per °C'.

The temperature coefficient of manufactured ohmic resistors ranges between 10ppm to 200ppm (regular resistors) and 7000ppm (temperature sensitive resistors).

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