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Carbon composition resistors come in several tolerances (accuracies) with
10% and 5% being the most common.
For this type of resistor, the value and tolerance are represented by four
bands of color on the tubular resistor body.
The band nearest one end is the first digit. Next is the second digit. The third band represents the multiplier, and the fourth band is the tolerance. |
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To determine the value of a resistor, combine the first and second digits
together, then add zeros as indicated by the multiplier.
The resistor shown above is yellow, violet, orange. therefore the value is 4 7 000 or 47K ohms. (Yellow is 4, Violet is 7, Orange is 3). Because the fourth band is silver, we know that it has a 10% tolerance. |
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