Resistance identification method of reading

Many of our daily lives in both resistance and electronic products, some very large, some very diverse kinds. The role of resistance are not the same, and some protective effect, and some limit, some when the sensor use. So in the circuit if the resistance becomes crucial for understanding. Here I read all of the resistance identification method. resistance is the most widely used circuit of a component. about components in the total number of electronic equipment more than 30%. the quality is good or bad for the stability of the circuit have a dramatic effect. In fact, "resistance" that is a kind of nature, and are usually referred to in the resistance of electronic products, is such a resistor kinds of components. Here we say resistance is a resistor in the electronic devices, people often referred to as the resistor resistance (hereinafter referred to as resistance.

Resistance to resistance abbreviated English name res, usually expressed by the letter R. The basic unit is the ohm resistors, using the Greek letter "��" to represent. Ohmic resistance of the unit is such a definition: a conductor with one volt voltage, resulting in corresponding to one ampere current resistance. resistor body in the nominal resistance is generally also identifies some of the power. Here we do not do the elaborate power resistor, the resistance of four of its nominal representation, namely: Straight standard method, text symbols Law, Law and color digital method.

A straight standard method
With Arabic numerals and units directly marked on the resistor surface and technical parameters of the nominal resistance, the resistance unit ohm with the "��", said thousands of Ou "K��" said Meg with a "M��" said the general tolerance percentage directly or �� (+ -5%, �� (+ -10%, �� (+ -20% said.

2 text symbol method
Arabic numerals and text symbols with a regular combination of both that the nominal resistance, and its tolerance in words symbols: B (+ -0.1%, C (+ -0.25%, D (+ -0.5%, F ( + -1%, G (+ -2%, J (+ -5%, K (+ -10%, M (+ -20%, N (+ -30%. sign in front of an integer number of said resistance, followed by The decimal numbers indicate resistance.

3 with three digits digital method, said first two numbers indicate the number of effective resistance, the third digit after the effective number of the number zero. When the resistance is less than 10 euro, often to �� R �� said as the decimal point will be R ohms. deviation usually symbols: B (+ -0.1%, C (+ -0.25%, D (+ -0.5%, F (+ -1%, G (+ -2%, J (+ -5%, K (+ -10%, M (+ -20%, N (+ -30%.

4) color standard method using color to indicate the size of a method of resistance. Tetracyclic used for small resistance and color ring or rings the size of the color ring for resistance.

Ring resistance: first, second, that resistance is an effective digital color ring, color ring, said third power of the number 10, the fourth color ring error for the resistance level. Pentacyclic resistance: the first, second and third ring said the three digits, the fourth ring indicates powers of 10 the number of rings, said first error level. resistor each color represents a number.

That is not all that much resistance? For example, I have a circuit obtained by calculating a future for the 888�� resistor to my calculations this resistor that is not really real. In a world where there is no resistance 888�� The resistance that only 887�� Why? That is because in order to standardize the production of resistors, but also allowing the user to within a certain tolerance resistors be used, the state provides a series of resistance as the product of standards, this series resistance is called the nominal resistance resistor. the more common standards E24, E48, E96, E192 and so on. relevant knowledge can be viewed <"Electronic equipment nominal resistance series resistor and fixed capacitors series and its tolerance Series>> National Standard GB 2471-81 there are detailed instructions.

4 ways to say the above is mainly for general resistance, and resistance to some specific example photosensitive resistance, thermal resistance, humidity resistance and so does not apply this method.

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