Identification method of color ring resistances
Color ring resistances are divided into four-color ring resistance, five-color ring resistance and six-color ring resistance.
This article is about the four-color ring resistance and five-color ring resistance.
When reading the color ring, first place the golden or silvery end of the resistor on the right side. From the left to the right, the first ring represents the first digit of the value (that is, the first one on the left of the number listed), the second ring represents the second digit of the value (the second one from the right), the third ring represents the third digit (the third one), the forth ring represents the error value of the resistance value. The common error rate of the golden one is ± 5 and the silvery is ± 10. Of course, the golden one is the best, but the price will be slightly higher. In order to make it easy for amateurs to read the relationship between each color and value, the following table were made. As for the resistance of the semi-variable and variable resistors, they are not represented by color circles, but the values are printed directly on the outer casing. When the resistance is too large, it is not convenient to list with numbers and may causes mistaken reading, such as 1,000,000Ω, one million ohms. When written on the circuit diagram, it will take up the space of the circuit diagram, so we simplify it with K and M for the digit thousands (103) and million (106). For example: 100000Ω is written as 100KΩ, and the above 1000000KΩ can be written as 1MΩ.
Example: four rings in order as brown, black, yellow and silver, read as 100000Ω = 100K, error is ± 10%.
Example: four rings in order as orange, white, brown and silver, read as 390Ω, error is ± 10%.
Example: four rings in order as orange, white, red and silver, read as 3900Ω = 3.9K, error is ± 10%.
Example: four rings in order as orange, orange, gold and silver, among which orange and orange is 33, then multiplied by 10-1=3.9Ω, error is ±10%
Example: four rings in order as yellow, purple, silver and silver, among which yellow and purple is 47,then multiplied by 10-2=0.47Ω, error is ±10%
It is known from the above that when reading a 0.1-9.9 Ω resistor, it is necessary to pay attention to the third color ring calibration method because it multiplies a negative number.
Methods to identify the five-ring resistance:
For some beginners, it is not difficult to identify the four-ring resistance, but it may be difficult to identify the five-ring resistance relative to the four-ring resistance. Here are some simple methods for those who are not familiar with the five-ring resistance. Hope they are agreeable to you.
Methods of identifying which is the first ring of the five rings:
The deviation ring of the four-ring resistance is generally golden or silvery. Normally it doesn’t tend to misidentify, but the five-ring resistance does. The deviation ring of the five-ring resistance has the same color as the first ring (the effective digital ring). If it’s read reversely, the result will be totally wrong. So, how to identify the first ring correctly? Now we’ll introduce as follow:
- The deviation ring is far from the other rings.
- The deviation ring is wider.
- The first ring is closer to the end.
- The effective digital ring is not golden or silvery. (If the first and second rings are golden or silvery from the end, then the other end ring is the first ring.)
- The deviation ring is not orange or yellow. (If an end ring is orange or yellow, it must be the first ring.)
- Trial reading: The resistance of the general finished resistance is less than 22MΩ. If the trial reading is greater than 22MΩ, it is wrong.
Please check the resistance value through the four-ring resistance calculator and five-ring resistance identification method.
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