Various materials present a certain resistance to the current that passes through them, and this resistance is called resistance, and the entity (element) that has this physical property of aggregate resistance is called a resistor (simply a conductor with a resistance value). Its role in the circuit is very important, in the computer boards and peripherals in the number is also very large.
Its classification is also varied, if classified by use: current limiting resistors, buck resistors, voltage divider resistors, protection resistors, start-up resistors, sampling resistors, decoupling resistors, signal attenuation resistors, etc.; if classified by shape and production materials: gold film resistors, carbon film resistors, cement resistors, non-inductive resistors, thermistors, varistors, pull-wire resistors, chip resistors, etc.; if categorized by power: 1/ 16W, 1/8W, 1/4W, 1/2W, 1W…… and so on.
These resistors are common resistors, so their resistance value of the nominal method we must know, the following I will take the computer host card on the most common chip resistors as an example (the other resistors nominal method of the same): Chip resistor nominal method of digital and color ring method of these two.
First of all, the digital method, usually there are three resistors on the number XXX, the first two numbers in turn is the number of tens and digits, the last number is 10 of the Xth power, the specific resistance value of the resistor is the first two numbers of the two-digit number multiplied by 10 of the Xth power of the ohms, such as labeled with a 104 resistor resistance is 100000 ohms (i.e., 100KΩ), labeled with a 473 resistor resistance value is 47000 ohms (i.e., 47KΩ); the following author to say a few words about the color ring method, this nominal method is the most common in all the resistor nominal method (patch shape of the relatively few), the common color ring usually has four rings, we will be the gold or silver ring as the last ring, the first three rings of the color corresponds to the corresponding number, we know the number of numbers we need to use the number of the above mentioned method of reading the value of its resistance, but We must first know what color represents what number to do, so we must remember such a mnemonic – black, brown, red, orange, yellow, green, blue, purple, gray and white, which corresponds to 0123456789, as for the gold and silver, respectively, said 10-1 and 10 -2, these two colors in the four-color ring resistor is only marked error value only, so as long as you understand the line. Below I also give two examples to illustrate, in order to understand and remember, such as marked brown, black, yellow and silver ring resistor resistance is 100000 ohms (i.e., 100KΩ), marked yellow, purple, orange and gold ring resistor resistance is 47000 ohms (i.e., 47KΩ). is a professional electronic components distributor and partners with original manufacturers, provides genuine integrated circuits and connectors, supply hard-to-find and discontinued parts. To get accurate data for millions of electronic parts.Enjoy affordable prices for quality products.
There is also a five-color ring resistor, this resistor are some relatively small resistance value, relatively high precision resistors, because there are applications in computer peripherals, so I also introduce: it is gold or silver for the penultimate ring, the first three color ring were the hundredths, tenths, digits, and the last color ring is the error value, the specific resistance value of such a resistor is the first three color ring on behalf of the three digits of the three numbers composed of Three digits multiplied by 10 of the negative 1 times or negative 2 times Ohm, such as marked with brown, purple, green, silver and brown ring of the resistor resistance value is 1.75Ω.
About some of the basics of the resistor is so much, just in the replacement of the resistor’s power should also be noted, usually 1/4 or 1/8 of the resistor to replace the chip resistor is not a problem.
Note: Using the digital method of the chip resistor is mostly black, the resistor in the circuit symbol for “R”.
In addition to resistors, the most common is capacitors, simply put, capacitors are containers that store electric charge. For the shape of the capacitor may be most of the people engaged in hardware know, so I only briefly say. Common capacitors according to the shape and production materials can be divided into: chip capacitors, tantalum electrolytic capacitors, aluminum electrolytic capacitors, OS solid capacitors, electrodeless electrolytic capacitors, porcelain capacitors, mica capacitors, polypropylene capacitors.