Page 33 - Testing Electronic Components

Colors Numbers
Black= 0

Brown= 1
Red= 2

Orange= 3
Yellow= 4

Green= 5

Blue= 6
Violet= 7

Grey= 8
White= 9

Gold= 5%
Silver= 10%

Resistor Colour Code

Typical Example on How to Calculate The Resistor Color Codes

Reading from left to right, the first band close to the edge gives the first
digit in the numerical value of R. The next band marks the second digit.
The third band is the decimal multiplier, which gives the number of zeros
after the two digits.

Example 1:

red violet red gold

The first band is red for 2 and the next band is violet for 7. The red
multiplier in the third band means add two zeroes to 27. The result can be
illustrated as follows:

red violet red

2 7 x 100 = 2700

Therefore, this R value is 2700Ω with tolerance +5%
The resistor tolerance means the amount by which the actual R can be
different from the colour-coded value.
For instance, the alone resistor value 2700Ω resistor with +5 percent
tolerance can have resistance 5 percent above or below the coded value.

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