WHY IS A RESISTOR COLOUR-CODED?

A resistor is colour-coded due to following reasons.

The colour codes are used to indicate the resistance values of a resistor in ohms and also its tolerance, expressed as a percentage of the preferred value. Resistance is the property of a conductor to resist the flow of current through it. Collisions are the basic cause of resistance.

A resistor is colour-coded because it is   possible to read the value of resistance  after the resistor is mounted on the printed circuit board and it can be seen from all sides.A resistor is colour-coded because printing on the resistor is unmanageable and always not workable.

HOW TO READ COLOUR CODES?

Most common colour band resistors are of four band resistor. In a four band resistor, the first two bands represent the first two significant digits followed by a band (third band) for the multiplier. The fourth band  represents the tolerance.

TOLERANCE:

Tolerance is the percentage of error between the actual measured resistive value. Tolerance is due to the manufacturing process and it is expressed as a percentage of its preferred value.

EXAMPLE :

CONCLUSION:

Color coding uses coloured bands to identify a resistors value and its percentage of tolerence.Did you check the values of carbon resistors using above said color codes method for your electronic project?