Can anyone tell me how the resistance of the resistor is how big it is

Example 1The three-ring resistor is green, brown, and orange. Clause.

The first and second rings are green-brown, that is, 51, and the third ring is orange, that is, the magnitude is 10x10x10, so 51x10x10x10 = 51 thousand ohms, 20 meters. When looking for a resistor of this value in a stack of resistors, first look at the third ring, which is orange, which is on the order of 10 thousand ohms, and then look at the first ring.

The first and second rings are greenish-brown, and a resistor of 51 kulms can be found.

Example 2The three-ring resistance is red-red-green. i.e. O, 20. The third ring of the megaohm resistor is green, and the resistor of a larger order, such as 10 m ohm is brown, black and blue, and the third ring is blue, is rarely used.

Example 3The three-ring resistance is yellow-purple-brown. i.e. 470 euros, taxi 20.

Example 4The three-ring resistance is orange-orange-black. i.e. 33 euros, 20 taxis. Note that the third ring is black, and the magnification is 1, so 33x1 = 33 ohms.

Example 5The four-ring resistor is blue-gray-yellow-silver. i.e. 680k ohms, 10 tax.

Example 6The four-ring resistor is brown-red-gold. i.e. O, Taxi 5.

Example 7The five-ring resistance is red, yellow, and brown. Note that the first three digits of the five-ring resistor represent the numerical value, the fourth ring is the multiplier, and the silver represents the multiplier of 1 100. The fifth ring is the tolerance, and the brown is 1. Therefore, it is 249x1 100 = 1% of euros.

Resources.

1 brown, 2 red, 3 orange, 4 yellow, 5 green, 6 blue, 7 purple, 8 gray, 9 white, 0 black. The first two digits are the resistances, and the last digits are the number of 0s. For example, the color ring of a resistor is red, red, and orange, which is 223, that is, 22 followed by three zeros, which is 22000 euros.

The resistance of a conductor to an electric current is called the resistance of the conductor. Resistance (usually denoted by "R") is a physical quantity that indicates the magnitude of a conductor's resistance to an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current.

Different conductors, the resistance is generally different, and resistance is a property of the conductor itself. The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, referred to as ohm, and the symbol is .

The electric current in a metallic conductor is formed by the directional movement of free electrons. Free electrons collide frequently with metal cations in motion, and the number of collisions per second is as high as about 1015. This collision hinders the directional movement of free electrons, and the physical quantity that indicates this hindrance is called resistance.

Not only metal conductors have resistance, but other objects also have resistance. The resistance of a conductor is determined by its own physical conditions, and the resistance of a metal conductor is determined by its material properties, length, thickness (cross-sectional area), and service temperature.

1. Color ring method.

The so-called color ring method uses different color scales to represent the resistance parameters. There are 4 color rings and 5 color rings, and the meaning of each color ring is as follows.

2. Digital law.

Because the resistance in the mobile phone circuit is generally relatively small, it is rarely marked with the resistance value, and even if there is, the digital method is generally used, namely: 101 - represents 10*10 1 that is, 100 ohm resistance;

102 - represents the resistance of 10*10 2;

10 3 – represents a resistance of 10k;

10 4 – Indicates a resistance of 100k.

If a resistor is superscripted 22*10 3, then this resistor is 22k.

How to read the resistor color ring:

According to the number of color rings, it is generally divided into four color rings and five color rings. Each color wheel represents a different meaning, as shown in the image below.

Four-color ring reading method The first color circle: the first significant digit; Second color wheel: second significant number; The third color wheel:

Indicates magnification; The fourth color ring: Shiye Chun indicates error, that is, accuracy; Four-color ring example: First color wheel:

yellow, for 4; The second color wheel: purple, which represents 7; The first three color rings: red, representing the square of 10; The fourth color wheel:

brown, for 1%; So, the resistance of this resistor is 47 10 2 = 4700 = ohms, and the error is 1%. Five-color ring reading method The first color circle: the first significant digit; Second color wheel:

the second significant figure; 3rd color wheel: 3rd significant digit; The fourth color wheel: indicates magnification; Fifth color wheel:

Represents error, i.e., accuracy; Examples of five-color rings: the first color circle: yellow, which represents 4; Second color wheel:

purple, for 7; The third color wheel: black, for 0; The fourth color wheel: brown, representing 10; Fifth color wheel:

brown, for 1%; So, the resistance of this resistor is 470 10 = 4700 = ohms and the error is 1%. In reality, no one will memorize the value represented by the color ring, and now many color ring colors are not standard, which brings interference to identification. If you meet a person in real life who can read the resistance correctly without the help of any tools but only through the color ring, then call him the great god.

2. There is a digital silk screen on the surface of the reading method, as long as the meaning of the number is clear, the resistance value and accuracy can be determined. The accuracy of chip resistance resistance error is 1%, 2%, 5%, 10% accuracy, the most commonly used are 1% and 5%, 5% accuracy is represented by three digits, and 1% accuracy is represented by four digits. Here are some examples:

The silk screen on the surface of the resistor is 103: the first two digits 10 represent significant figures, and the third digit 3 represents the magnification, that is, 10 3, so the resistance value of the 103 resistor is 10 10 3 = 10000 = 10k, and the accuracy is 5%. The silk screen on the resistor surface is 1502:

The first three digits 150 represent significant figures, and the fourth digit 2 represents the magnification, that is, 10 2, so the resistance value of the 1502 resistor is 150 10 2 = 15000 = 15k, and the accuracy is 1%. There is also a case, that is, the case of silkscreen with r, which means that there is a resistance with a decimal number, and the position where r is located is the position of the decimal point. The silk screen on the surface of the resistor is R047:

The position of r represents the position of the decimal point, and r047 represents the resistance of ohms.

Formula: Brown, red, two orange are three, four yellow, five green, six are blue, seven purple, eight gray and nine white, black is zero number hidden, gold, five silver, ten tables error limb Zen.

The first three rings of the five-ring resistance are numbers, the fourth ring represents the number of times the resistance value, and the last ring is the error.

Color wheel sorting judgment.

Tip 1: Find the color wheel that marks the error first, so as to arrange the color wheel order. The most commonly used color to indicate resistance error is:

Gold, silver, brown, especially gold rings and silver rings, are generally rarely used as the first ring of the resistance color ring, so as long as there are gold rings and silver rings on the resistance, it can be basically determined that this is the last link of the color ring resistance.

Tip 2: In practice, you can judge the interval between the color rings: for example, for a resistor with five color rings, the interval between the fifth and fourth rings is wider than the interval between the first and second rings, so that the order of the color rings can be determined.

<> Orange, Black, Silver, Gold, Four-Color Ring Resistance Orange = 3, Black = 0, Silver = , Gold = Error = 5%.

Resistance = 30