HOW TO READ RESISTOR COLOUR CODE

Resistor colour coding is used to represent the value and tolerance of a resistor. This colour coding could be four, five or sometimes six.

In a four band colour coding, the first two colours represents the first and second digits, the third colour serves as the multiplier and the last colour is the tolerance.

To find the resistance of a resistor whose colours are Orange, Orange, Brown and Gold.

Orange = Ist digit = 3

Orange = 2nd digit = 3

Brown = Multiplier = x10

Gold = Tolerance = + 5%

= 33 x 10 + 5%  = 330 ohms

In a five band colour coding, the first three colours are the first, second and third digits, the fourth colour is the multiplier and the last colour is the tolerance.