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The resistance available in the market follow a strict colour band code and by noticing the colour ,value of the resistance can be easily calculated...

The colour code is

colour

value

multiplier

tolerance

black

0

1

brown

1

10

1%

red

2

100

2%

orange

3

1000

3%

yellow

4

10,000

green

5

1,00,000

0.5%

blue

6

0.25%

violet

7

0.1%

grey

8

0.05%

white

9

gold

5%

silver

10%

none(no colour)

20%

Here i represent you a simple way to remember the above sequence of colours:-

"B B ROY Great Britain Very Good Wife"

B-black

B-brown

ROY-Red-Orange-Yellow

Great-Green

Britain-blue

Very-violet

Good-grey

Wife-white

The resistance from the code can be calculated by reading the bands eg:-

a four colour band reads as red ,brown, orange and silver at the end ,then it's resistance is given as 21*1000 with 10% tolerance i.e. 21 kohm with 10% tolerance...

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