Märkning resistorer
En resistor, även kallad motstånd, är en passiv elektronisk komponent som utgör ett hinder för elektronernas rörelse i ett elektriskt fält.
Räkna ut resistans från färgkod
Dess resistans är ett mått på storleken av detta hinder och beräknas som kvoten mellan spänning och ström enligt Ohms lag. There are many different types of resistors available. In order to identify or calculate the resistance value of a resistor, it is important to have a marking system. Resistor Color Code is one way to represent the value of the resistance along with the tolerance. Resistor color code is used to indicate the value of resistance.
The standards for color coding registers are defined in international standards IEC This standard describes color coding for axially leaded resistors and numeric code for SMD resistors. There are several bands to specify the value of resistance. They even specify tolerance, reliability and failure rate. The number of bands vary from three to six. In case of 3 band code, the first two indicate the value of resistance and the third band acts as multiplier.
For example if the colors on the resistor are in the order of Yellow, Violet and Red from left, then the resistance can be calculated as.
Resistor Color Codes
High precision resistors have an extra band which is used to indicate the third significant value of the resistance. The rest of the bands indicate the same things as four band color code. For example, if colors on a five band resistor are in the order Red, Blue, Black, Orange and Gray then the value of resistance is calculated as ×± 0. In three digit coding, the first two numbers indicate the significant value of the resistance and the third number indicates the multiplier like 10 in case the digit is 1, in case the digit is 2 or in case the digit is 3 and so on.
If the resistance is less than 10Ω then the letter R is used to indicate the position of the decimal point. For example. For more precision resistors, a four digit code is marked on them. The calculation is similar to three digit code. The first three numbers indicate the significant value of the resistance and the fourth number indicates the multiplier. Some examples under this system are. Electronic Industries Association EIA specified a standard preferred value system for resistors and is named as E series.
IEC is an international standard which defines the preferred number series in resistors and also for capacitors, inductors and Zener Diodes. The coding is based on the tolerance values and different E series available are. There is a separate coding system in EIA E96 marking system. This system uses three figures for marking. The first two are numerals which indicate the three significant digits of the value of resistance.
The third figure is a letter used to indicate the multiplier.
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