Color Code of Resistors :
The value of a fixed resistor is encoded in three color bands. A fourth band shows the possible variation of resistance between individual resistors of the given type. Each color represents a number according to the following scheme.
The first band on a resistor is interpreted as the FIRST DIGIT of the resistor value. For the resistor shown, the first band is yellow so the first digit is 4.
The second band gives the SECOND DIGIT. This is a violet band, making the second digit 7. The third band is called the MULTIPLIER and is not interpreted in quite the same way.
The multiplier tells you how many zeroes you should write after the digits you already have. A red band tells you to add 2 zeroes.
The value of this resistor is therefore 4 7 0 0 ohms.
The fourth band is called the TOLERANCE band. This indicates the percentage accuracy of the resistor value. Most carbon film resistors have a gold-colored tolerance band, indicating that the actual resistance value is with + or – 5% of the nominal value.
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