Colour Code For carbon Resistances

Carbon resistors are more common in electronic equipment. They consist of a high-grade ceramic rod or cone (called the substrate) on which is deposited a thin resistive film of carbon. The numerical value of their resistance is indicated by a colour code which consists of bands of different colour printed on the body of the resistor. The colours used in this code and the digits represented by them in the table below:                                                                                                                                                                                                                                                                   
1. The First band indicates the first digit in the numerical value of the resistance.
2. The second band gives the second digit.
3. The third band is a decimal multiplier i.e. it gives the zeros after the first two digits.
4. The fourth band gives tolerance. Its colour is either silver or gold. Silver band indicates a tolerance of +10% or -10%, a gold band shows a tolerance of +5% or -5%.

Note: If there is no fourth band, tolerance is understood to be +20% or -20%.