[Photo] Identification of resistance and capacitance

1. Color circle representation of resistance

1. Correspondence between colors and numbers:

Brown red Orange yellow green blue purple gray White black gold silver 1 2 3 4 5 6 7 8 9 0 0.1 0.01

Note: When gold and silver appear in the fourth ring, they represent the error, gold represents 5%, silver represents 10%; and when the third ring appears, gold represents 0.1 and silver represents 0.01. See the example below.

2. "Four color circle" reading rules

First, the second ring represents two significant digits, and the third ring represents the number with "0" added after the number. Such as:

example 1 :

red purple Orange 　 gold 2 7 3 0s 　 5%

Resistance value: "3 0s" is added after 27, which is 27000 Euro, with an error of 5%

Example 2: If the third ring is golden

red purple gold gold 2 7 0.1 5%

Resistance: 27 decimal points move forward 1 digit, that is 2.7 ohms, error 5%

Example 3:

red red Brown gold 2 2 1 0 5%

Resistance value: add a 0 or 220 ohm after 22, error 5%

Example 4:

red red black gold 2 2 0 0 5%

The resistance value shown in Example 4 is 22 ohms. The third ring "black" means "zero zero", i.e. without addition of 0 indicates that the following number.

In fact, the third ring is expressed in mathematical form as a power of 10 to the Nth power. The previous cases can be written as: 27 & TImes; 103 = 27000 22 & TImes; 101 = 220 22 & TImes; 10 ° = 22 1000 ohms = 1000 ohms, 1000 ohms = 1 megaohm. Europe, that is ohm, the symbol is Ω; kilo-ohm: ΚΩ; megohm: M Ω.

3. Reading rule of "five-color circle":

The first, second, and third rings represent three digits, the fourth ring represents the number of "0" s behind the number, and the fifth ring represents precision. The five-color ring is gradually dominating the market, and the method of representing the accuracy of the fifth ring is currently different from the relevant regulations in the past. The error is generally expressed in brown 1%. Examples are as follows:

Example 5:

red black black Orange Brown 2 0 0 3 0s 1%

The resistance of this resistor: 200,000 ohm = 200K, error 1%

Example 6:

Green = 5, Brown = 1, Black = 0, Silver = 0.01, then Resistance = 510 & TImes; 0.01 = 5.1Ω

Method of expressing the capacity of two capacitor

The basic unit of capacitor capacity is "Farads" (F), 1/1000000 of 1 Farad (one millionth) is 1 microfarad (μF), 1/1000000 of 1 Microfarad is 1pF (1 picofarad, or 1 picofarad). The relationship between them is one million (or 10 to the 6th power) carry relationship. Our commonly used capacitors are:

1. Dielectric capacitance: most of them are above 1 μ F, which is directly expressed by numbers. For example: 4.7 μ F, 100 μ F, 220 μ F, etc. The two poles of this capacitor are positive and negative, and the long legs are positive. 2. Porcelain chip capacitors: most of them are below 1 μF, directly expressed by numbers. Such as: 10, 22, 0.047, 0.1, etc., the unit to be noted here is. Where an integer is used, the unit defaults to pF; where a decimal is used, the unit default is μF. As in the above example, they are 10P, 22P, 0.047μF, 220μF, etc.

Now there is another expression method similar to the color circle resistance in the world (the unit is pF): For example: "473" is 47 000 pF = 0.047 μ F "103" is 10 000 pF = 0.01 μ F and so on, The first and second digits of "XXX" are significant digits, and the third digit represents the number after which 0 is added. This notation is quite common.

Intelligent Street Lamps are also called intelligent lighting or smart street lights.It adopts the Internet of things and cloud computing technology to comprehensively upgrade the urban public lighting management system, so as to realize centralized control, operation and maintenance information and intelligent lighting of street lamps.The most advanced versions of Intelligent Street Lamps have been designed to create a happy atmosphere in roads, streets, squares and other places.The design of intelligent street lamps can only be designed by a wide range of discussions and environments that provide an aesthetic consistency.

Intelligent Street Lamp system

The core functions of intelligent Street Lamp include Intelligent lighting,Smart city applications,The information publishing system,Intelligent security,Charging pile,Distributed monitoring sensor system.

Product feature

1.Sensor

Sensor norise

Air pollution sensor

Temperature/humidity sensor

Brightness sensor

Municipal construction monitor

2.RFID

Special crowed monitor

CMC monitor

Community security monitor

Municipal facilities monitor

3.Communication Services

Micro base station

Street lights embedded WIFI hot spot

4.Video Monitor

Security monitor

Vehicle monitor

5.Emergency Broadcast

Active of the external field radio monitoring center

6.Intelligent Lighting

Cellular cooling technology

Based on the luminance uniformity of light distribution

Intelligent single lamp/center controller

Variety of modular design lamp,holder is optional.

7.Information Release

Advertising exposure

Current politics news

Information release

8.Charging Column

Electric car

Electric bicycle

Intelligent Street Lamp

Intelligent Street Lamp,Street Lamp,Street Lamp Post,Intelligent Lamp

Jiangsu chengxu Electric Group Co., Ltd , https://www.satislighting.com