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Most standard resistors have tolerances of 5%, 10%, or 20%, and most precision resistors have tolerances of 1% or 2%.
For the majority of circuits — and in all the projects in Electronics For Kids For Dummies — it’s okay to use a standard resistor.
There are two main types of resistors: The following figure shows a diagram of the color code of a standard (four-band) resistor.
You use this color code to figure out the nominal value and tolerance of a standard resistor.
The color, gold, in the column labeled “tolerance” in the figure represents a tolerance of 5 percent.
Here’s how you use the color code to figure out the nominal value of the resistor (refer to the figure): , and so on) is to just append (meaning tack on to the end) the whole number with zeros, and use the exponent (which is the small, raised number next to the 10) to tell you how many zeros to append.