Resistance color code
The resistance is represented by Om (ω), named after Georg Simon Ohm.Ohm is equivalent to each Ampel (V) (A).The Om Law stipulates the behavior of the resistor in the ideal settings. The formula is: V = I * R, where V is the voltage, i is the current, and R is the resistor.
The resistor has a variety of packaging, materials and various functions.In -depth research on each type of resistance and its expected application exceeds the scope of this article, but I want to talk about some common type electronic components of the Feilidi brand.The chassis installation of the resistor is a heterogeneity of the resistor class.Generally, their rated power can start around 5 watts, and our rated power is currently up to 2.5 kilowatts.The resistor installed on the chassis is usually installed on the chassis or radiator to assist heat transfer.According to the composition and packaging type, the pore resistor can also belong to high -power categories.The common high-power packaging of the hole resistance is to-247 packaging, which can provide better heat dissipation effects.
In the Tongkou series, the more common resistance type is: axial -oriented carbon membrane and metal membrane.They are usually from 1/8 watt to a few watts.The chip resistor series includes a typical 0805,0603 and 0402 -encapsulated resistors, as well as many other physical sizes.Although there are some higher power options in the chip resistor series, this situation is rare.They are usually used for low -power applications.Using the design of the resistor array (usually the same ohm value) can use the resistance network.The resistance network combines two to 28 resistors in one package; the most common is the four and eight resistors in the same packaging.Packaging has chips, SIP (single -column direct -inserted packaging) andDIP(Double -column direct packaging) layout.Please note: Feilidi has an additional series in the resistor category for dedicated resistors.These are usually temperature -sensitive resistors, focusing on temperature compensationCircuit。
picture1: The color code of the resistor represents an example.
Electronic color code has been used since the early 1920s.Developed by the Radio Manufacturer Association (RMA), it evolved into a ribbon we see on the resistor because it is a cheap and simple method for identifying small components.Color code is taught in entry -level electronic courses, and most students remember charts (Figure 1).Most people in the industry know that notes used to remember the order of color code. Among them, the most popular is "Big Boy's Young Girls, but Violet usually wins", these colors correspond to color;, Orange, yellow, green, blue, purple, gray and white.Obviously, this does not consider Gold, Silver and None.In fact, there are hundreds of different notes, including these missing bands.userYou can choose any stick in the head.
First of all, each rule and resistor have exceptions.The most common exception is the zero ohm resistor, which can be easily identified by a single black belt (picture2).These are connected printingCircuit boardCommon methods of trace lines.These designers are likely to use them to use the machine in automatic assembly.In addition, in some cases, the military qualified resistor has a fifth frequency band to indicate the failure rate.There are still a resistor with unsuitable colors that are not suitable for color charts.This may be caused by damage, wear, or user color perception.
Reasons for abnormal ribbon -color blindness
Color blindness is a common problem that recognizes resistors that meet the standards of the ribbon.According to the National Institute of Ophthalmology (Nei), 12maleIn the middleOne and 200 women have one with a certain form of color blindness.There must be a solution for such a common problem, right?After doing some research, the answer is, not true.The general consensus is that when identifying color code, people with color blindness must usually get a second opinion.Since most designers can use itmultimeterSo this is another solution.According to the brands and functions you are seeking, the multimeter can be relatively cheap to very expensive.Very simple handheld version should meet any resistanceMeasurementneed.It is important to remember that the resistance measurement is the most accurate in the circuit because it may be affected by other components on the circuit board.It is self -evident, but in case of case, please make sure that the power is disconnected before measuring the resistance to prevent meltingfuseOr damage the instrument.The measurement value will be the actual resistance value plus or minus its tolerance.An example is1kΩ resistor, 5 % tolerant can measure as low as 950Ω or up to 1.05kΩ
in conclusion
The basic operation of the resistor is to teach things in the early stages of electronics, carrying with decoding bands.Although the actual specifications of physical printing components can be used, ordinary pore resistors are still using color code to date.In my opinion, the reason behind this is to introduce the value of decoding other devices for the future engineers, such asintegrated circuitWait.Although there are other methods to determine the value of the resistance, the color code still exists in the foreseeable future.
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