Tips for color ring resistance
As one of the commonly used electronic components in electronic circuits, color ring resistors use numerical rings of different colors to
represent numerical values and errors. Color ring resistors have no identified numbers, which makes it easy to read errors and not read. Case. Today to share a little knowledge, how to know and read the color ring resistance.
There are 12 colors on the color ring resistance, which are brown red orange yellow green blue purple gray white black gold silver. Different colors represent different meanings and values. In the four-color ring resistance, the first color ring represents the largest one digit of the resistance; the second color ring represents the second digit of the resistance; the third color ring represents the resistance multiplied by the number; The color circle indicates the tolerance (accuracy) allowed for the resistance. In the five-color ring resistance, the first color ring represents the largest one digit of the resistance; the second color ring represents the second digit of the resistance; the third color ring represents the third digit of the resistance; The color circle represents the multiplier of the resistance; the fifth color ring represents the error range. The six-color ring resistance refers to a resistance with a six-color ring representing the resistance. The first five-color ring of the six-color ring resistor is the same as the five-color ring resistance, and the sixth color ring represents the temperature coefficient of the resistor.
When the value is expressed, the colors are as follows：
Black: 0 Brown: 1 Red: 2 Orange: 3 Yellow: 4 Green: 5 Blue: 6 Purple: 7 Gray: 8 White: 9
When expressed in order of magnitude
Black: 0 Brown: 1 Red: 2 Orange: 3 Yellow: 4 Green: 5 Blue: 6 Violet: 7 Gray: 8 White: 9 Gold: -1: Silver-2
When indicating an error
Brown: ±1 Red: ±2 Green: ±0.5 Blue: ±0.25 Purple: ±0.1 Gray: ±0.05 Gold: ±5 Silver: ±10.
Express temperature relationship
Brown: 100 Red: 50 Orange: 15 Yellow: 25 Blue: 10 Purple: 5 White: 10
To put it simply, the fourth ring of the 4-ring resistor or the fourth ring of the 5-ring 6-ring resistor is a few zeros after the effective number. If it is a negative number, the decimal point of several significant digits is shifted to the left by a few digits. This makes it easy to divide the color ring resistance into three levels. Gold, black, and brown are expressed in ohms; red, orange, and yellow represent thousands of ohms; green and blue are mega-ohms.
Three trial tips for color ring resistance:
Tip 1: First find the color circle of the mark error, and then arrange the color ring order. The most commonly used colors for resistance errors are: gold, silver, brown, especially gold rings and silver rings, which are rarely used as the first ring of the resistance color ring, so as long as there are gold rings and silver rings in the resistance, It can be basically assumed that this is the last ring of the color ring resistance.
Tip 2: Whether the brown ring is the discriminant of the error sign. The brown ring is often used as an error loop, and often as an effective digital ring, and often appears in both the first ring and the last ring, making it difficult to identify who is the first ring. In practice, it can be discriminated according to the interval between the color rings: for example, for the resistance of a five-color ring, the interval between the fifth ring and the fourth ring is smaller than the interval between the first ring and the second ring. To be wider, it is possible to determine the order in which the color circles are arranged.
Tip 3: In the case where the color circle interval cannot be determined by the color circle spacing alone, the production sequence value of the resistor can also be used for discrimination. For example, the color ring resistor read order of a resistor is: brown, black, black, yellow, brown, and its value is: 100×10000=1MΩ, the error is 1%, which belongs to the normal resistance series value. If it is reverse order read: brown, yellow , black, black, brown, the value is 140 × 1 Ω = 140 Ω, the error is 1%. Obviously, the resistance values read in the latter order are not found in the series of resistors, so the latter color ring sequence is incorrect.