If you have just purchased a resistor, it will generally come with some sort of label, but that doesn’t help if you find your resistor sitting unaccompanied on a table or in your parts box. Fortunately, every resistor has a set of color bands printed on its casing that tells you the value of the resistor. While there are resistors with six, three, or even one band, the most commonly found resistors by far have four bands, and we are looking at that type in this appendix.
Identifying Resistors by Color Bands
Let’s take a close look at a resistor in Figure A-1. A resistor has two wire leads and a body with color bands on it.
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