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2015-01-12T00:35:18+05:30

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On a resistance usually, we have  4 circular  color bands on the cylindrical  surface of the body of resistance.  These colors represent  a digit.  From left side, the first three colors bands represent  the digits as follows.  The fourth color band to the extreme right represents the  exponent for 10, which  multiplies the the 3 digit number , to give final resistance value.

There is also a 5th digit  that usually gives the tolerance for the resistance.  That is the (maximum) error percentage in the value of resistance.

=========================================================
color        value of digit  for      4th band                  tolerance % given by
               the first 3 digits       multiplier                   the 5th color band
==========================================================
Black          0                       10^0 = 1 ohm                    0 %
Brown          1                      10^1  ohm                         1 %
Red              2                      10^2 ohms                      2 %

Orange        3                      10^3 = 1 k ohm             
Yellow          4                      10^4 = 10 kOhms       
Green          5                      10^5 = 100 k ohms            0.5 %

Blue             6                    10^6 = 1 mega ohm            0.25 %
Violet        7                      10^7  = 10 mega ohm           0.10 %
Grey          8                      10^8                                  0.05 %
 White      9                       10^9           
==============================
Gold        -                        0.1 = 10^-1  ohm                   5 %
Silver        --                       0.01= 10^-2  ohms                10%
================================

Let us say the left most color is Red, then yellow, then violet.  then orange.  Then silver bands are there on the resistance, in the lab.

value of resistance is : 247 * 10^3 ohms with a tolerance of +- 10%
  ie., the resistance is with in the range of :    247k ohms - 24.7 kohms  to 247 kohms + 24.7 kohms.


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