Specifically explain the content of the picture, such as: the symbol of the potential P, the grounding effect in the typical situation. Quick, thank you
Specifically explain the content of the picture, such as: the symbol of the potential P, the grounding effect in the typical situation. Quick, thank you
Two of the conductors close to each other, a layer of non -conductive insulating medium is clamped in the middle, which constitutes a capacitor. When the two polar plates of the capacitor are added with a voltage, the capacitor is stored in charge. The capacity of the capacitor is equal to the amount of charge on the electrode plate from the voltage between the two polar plates. The basic unit of capacitors of capacitors is Fara (F). In the circuit diagram, letters C generally use the capacitor element.
The capacitor plays an important role in circuits such as tuning, bypass, coupling, filtering. The tuning circuit of the transistor radio should be used for it, and the coupling circuit, bypass circuit, etc. of the color TV must also be used.
With the rapid development of electronic information technology, the update speed of digital electronic products is getting faster and faster. Consumer electronics products mainly based on tablet TVs (LCD and PDP), laptops, digital cameras and other products continue Growth has driven the growth of the capacitor industry.
The introduction
Capacity is an component of storage power and electrical energy (potential energy). One conductor is surrounded by another conductor, or the conductor system that is terminated in another conductor is called a capacitor.
The capacitor formula of parallel board capacitors:
Among them, UA-Ub is the difference between the two flat-line boards, εr is relative dielectric constant, K is static electric constant, S is two board positive positive positives Dive area, D is the distance between the two boards. Note: The electric field in the parallel board capacitor is a uniform electric field. [3]
The capacitors are different from the capacitor. The capacitance is the basic physical quantity, symbol C, and the unit is F (Fara). [3]
M general formula C = q/u, parallel board capacitor special formula: board electric field strength E = U/d. [3]
The main parameters of the capacitor edit
(1) Named electricity capacity, which is a capacitance marked on the capacitor. However, the actual power capacity of the capacitor is the same as that of the
capacitor charging process
Them named electric capacity is deviated, and the accuracy level has a corresponding relationship with the allowable errors. General capacitors are commonly used Ⅰ, Ⅱ, and III, and electrolytic capacitors are used to indicate capacity accuracy with ⅳ, ⅴ, and ⅵ grades, and choose according to the purpose. The capacitance value of electrolytic capacitors depends on the impedance presented at the time of work under AC voltage. With the changes in the operating frequency, temperature, voltage, and measurement method, the capacity will change accordingly. The unit of capacity is F (method). [4]
Since the capacitor is a "container" that stores charge, there is a problem of "capacity". In order to measure the capacity of the capacitor storage charge, the physical quantity of electricity capacity is determined. Capacitors must be stored under the action of external voltage to store charge. Different capacitors may also be stored in the same voltage. Internationally stipulates that when the capacitor is added to the capacitor, the amount of charge it can store is represented by the letters of the capacitor (that is, the power under the unit voltage) of the capacitor. The basic unit of capacity is Fara (F). Under the influence of 1 volt DC voltage, if the charge stored in a capacitor is 1 Cullen, the capacity is set to 1 Fara, Fara is expressed by symbol F, and 1F = 1Q/V. In practical applications, the capacitors of capacitors are often much smaller than 1 Fara, and they often use smaller units, such as the MF (MF), Micro Method (μF), NAF (NF), Pitter (PF), etc. They The relationship is: 1 micro method is equal to one millionth of Fara; 1 leather method is equal to one millionth of the micro -method, namely: [5]
1 Fara (f) = 1000 mm (MF); 1 millimeter; Method (mf) = 1000 micro method (μF); 1 micro method (μF) = 1000 natta (NF); 1 Na method (NF) = 1000 leather (PF); that is: 1F = 1000000 μF; 1 μF = 1000000pf. [5]
(2) The rated voltage can be continuously added to the maximum DC voltage of the capacitor at the minimum environmental temperature and rated ambient temperature. If the working voltage exceeds the resistance of the capacitor, the capacitor will be broken down and causes damage. In reality, as the temperature rises, the pressure resistance will become lower. [4]
(3) Insulation resistance. The DC voltage is added to the capacitor to generate the leakage current, and the ratio of the two is called the insulation resistance. When the capacitance is small, its value mainly depends on the surface state of the capacitor; when the capacity is greater than 0.1 μF, its value mainly depends on the medium. Generally, the greater the insulation resistance, the better. [4]
(4) Losses. The capacitor is called loss due to the energy consumed by the heat during the unit time under the influence of the electric field. Losses are related to the frequency range, medium, conductivity, and resistance of the metal part of the capacitance. [4]
(5) frequency characteristics. As the frequency rises, the capacity of general capacitors shows a decline. When the capacitor works below the resonance frequency, it is manifested as capacity; when it exceeds its resonance frequency, it is emotional. At this time, it is not a capacitor but an inductance. Therefore, we must avoid capacitor work above the resonance frequency. [4]
Edit
Capacitors
Capacitors
In DC circuits, capacitors are equivalent to disconnecting circuits. Capacitors are a component that can store charge and one of the most commonly used electronic components. [6]
This to start with the structure of the capacitor. The easiest capacitor is composed of the pole plates at both ends and the middle insulation medium (including air) in the middle. After power -on, the polar plate is charged to form a voltage (poor potential), but due to the middle insulation, the entire capacitor is not conductive. However, this situation is under the prerequisites that do not exceed the critical voltage (breakdown voltage) of the capacitor. We know that any material is relatively insulating. When the voltage at both ends of the material increases to a certain degree, the material can be conducted. We call this voltage for a breakdown voltage. The capacitance is no exception. After the capacitance is penetrated, it is not an insulator. However, at the middle of the middle, such voltages are not seen in the circuit, so they work below the breakdown voltage, which can be regarded as insulators. [6]
, in the AC circuit, the direction of the current becomes a certain functional relationship change over time. The process of capacitor charging and discharge is time. At this time, a change of electric field formed between the polar plates, and this electric field is also a function of changing over time. In fact, the current is passed by the capacitor through the form of a electric field. [6]
The role of capacitors:
● Coupling: The capacitance used in the coupling circuit is called a coupling capacitor, and the capacitor circuit is used in large quantities in blocking capacitors and other capacitor coupling circuits, which is separated by separation. DC communication. [6]
● Filter: The capacitor used in the filter circuit is called a filter capacitor. This capacitor circuit is used in power filtering and various filter circuits. Remove. [6]
● Antuctive coupling: The capacitor used in the degenerate circuit is called a degenerate capacitor, and the Coupling circuit is used in the DC voltage supply circuit of a multi -stage amplifier. The harmful low frequency interface. [6]
● High -frequency vibration: The capacitance used in high -frequency anti -vibration circuit is called a high -frequency vibration capacitor. In the audio negative feedback amplifier, in order to eliminate the high frequency self -excitement that may occur, use it, adopts the use This capacitor circuit is used to eliminate the high frequency screams that the amplifier may appear. [6]
● Resonance: The capacitor used in the LC resonance circuit is called a resonant capacitor. This capacitor circuit requires this capacitance circuit in parallel and series resonance circuits. [6]
● Wingrser: The capacitors used in the bypass circuit are called bypass capacitors. If the circuit needs to remove the signal of a certain frequency band from the signal, you can use the bypass capacitor circuit and according to the removing signal removed, according to the signal removed, the signal is removed. Different frequencies, there are all -frequency domain (all AC signals) bypass capacitor circuits and high -frequency bypass capacitor circuits. [6]
● Neutralization: The capacitors used in neutralized circuits are called neutralized capacitors. In the high -frequency and medium frequency amplifier in the radio, in the high -frequency large -frequency large -frequency large -frequency large velocity, this neutralized capacitor circuit is used to eliminate self -excitation. [6]
● Time: Capacitors used in the timing circuit are called timing capacitors. Use a regular capacitance circuit to control the time control of time control through the capacitor charging and discharge, and the capacitor controls time constant size. [6]
● Points: The capacitors used in the integral circuit are called integration capacitors. In the synchronous separation circuit scanned by the potential field, this integral capacitance circuit is used, and the synchronous signal can be taken from the field composite synchronization signal. [6]
● Dimension: The capacitor used in a differential circuit is called a differential capacitor. In order to obtain a spoof trigger signal in the trigger circuit, this differential capacitor circuit is used to obtain the top pulse trigger signal from various types (mainly rectangular pulses) signals. [6]
● Compensation: The capacitors used in compensation circuits are called compensation capacitors. In the bass compensation circuit of the card seat, this low -frequency compensation capacitor circuit is used to enhance the low -frequency signal in the sound release signal. In addition, And high -frequency compensation capacitor circuits. [6]
● Self -lifting: The capacitor used in the self -lifting circuit is called a self -lifting capacitor. The commonly used OTL power amplifier output class circuit uses this self -lifting capacitor circuit to increase the signal by a small amount through a positive feedback method. Half a week. [6] rn●分频：在分频电路中的电容器称为分频电容，在音箱的扬声器分频电路中，使用分频电容电路，以使高频扬声器工作在高频段，中频The speaker works in the medium frequency band, and the low -frequency speaker works in the low frequency band. [6]
● Load capacitance: refers to an effective external capacitance that determines the load resonance frequency with the quartz crystal resonator. The standard values commonly used in load capacitors are 16pf, 20pf, 30pf, 50pf and 100pf. The load capacitance can be adjusted appropriately according to the specific situation. By adjusting, the operating frequency of the resonant can be adjusted to the nominal value.
I was in the four -time beauty of the motherland, and I worshiped the famous mountains and rivers of the motherland. Whenever I am in the arms of my motherland, my heart is!
It with a kind of respectful mood, I reached the pinnacle of Mount Tai, and saw a round of red sun spraying ...
I visited Bai Shan Heishui and saw the prosperity and prosperity of the motherland. Ascend the coral reef on the Nansha Islands! I feel the vastness of the motherland. At the eight hundred miles of Qinchuan, I heard the momentum of the children of the motherland. The prestige and drums that sounded into the sky, the strong shouting of the sky, and the strong and neat steps of the team, expressing the pride of my brothers and sisters.
At the foot of the mountains and the deep sand, I saw the strange and dangerous beauty of the lonely smoke of the desert, and the long river falls from the sun. It was the summoning of the northwest horn.
The I was standing at the top of the snow area of the Qinghai -Tibet Plateau, drinking a cup of comfortable milk tea, and celebrating the harmony and prosperity of 56 nations.
I I was beside the red grassland of Shangri -La on earth, and looked at the vicissitudes of ancient bunkers after vicissitudes, and I realized the responsibility and dignity as a Chinese.
It along the footprint of the Yangtze River and the Yellow River fiber, the stone pillar that stroked the deep seal of the fiber rope, my heart was like tide, tears and eyes, and the suffering of the motherland! You are so tenacious and tenacious!
I stood in the gully loess plateau, holding a hot loess to put it on my heart, and I felt the tenderness of the mother of the motherland.
The rice species of Hemom Ferry confirmed: People living in the land of the Chinese nation! Currencently condenses human wisdom and hard work.
The Yangtze River water in Gaoxia Pinghu confirmed: Nothing is unattainable, rivers on the earth! It can be affected by the Galaxy in the sky.
The Terracotta Warriors and Horses of Qin Shihuang told the world: Chinese children are unyielding nations. Although he sleeps for two thousand years, he still does not fall, fail, and yield.
The dark iron cannon announcement in the Dagukou Battery: If there is no diplomacy in the weak country, if you want to stand up, you can only lie down and try the long sword.
A nation without a country is a humiliated nation, and a cowardly nationality is a poor nation. A person can have no home but cannot have no motherland. No matter where you come from, no matter where you go, no matter which corner of the world, whenever you encounter difficulties and setbacks, just drink a lot: "I am Chinese! My motherland! ——It is China! "You can always be helped and encouraged, and your friendly and respectful eyes will gather to you.
I once again climbed to the peak of Taishan, looking forward to the places where the ancestors of the past generations, looking forward to the thinness and ascension of the Oriental Red Day again.
28
Inned 4
The characteristics of stepping on
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The stones on the upside, some rounds like 箪, and some squares are like 笥, which are very much like this, they are rolling down on the collapsed cliffs, making the turbulent river water even more turbulent, so it is told to make it new. beach. The remaining part of the collapsed cliff is towering compared to other mountains. There are more than a dozen miles down in the newly collapsed beach. There are Great Wushan. Its height is not only not available in the Three Gorges, but it can also compete with Shan Shan and Emeishan, and it is tied with Hengshan and Jiushan Mountain. Now let's appreciate the spectacle
221 Praise · 1,392 View 2017-11-26
Write a paragraph of attractions, using guide explanation skills
Great Wall tour guides, all our cars now our cars On the Badaling Expressway, it is about to enter the upcoming Badaling Scenic Area. The mountain in front is the Mountain Mountain, and the Badaling Great Wall is lined with this mountain. During the Spring and Autumn Period and the Warring States Period, the ancient people of my country had begun to build the Great Wall. At that time, the vassal hegemony was not violated in order to protect their territory. In my country, three peaks of the Great Wall have appeared, namely the Qin Great Wall, the Great Wall of the Han Dynasty, and the Ming Great Wall. Qin Shihuang unified the Central Plains in 221 BC and established the Qin dynasty. In order to strengthen the rule and defend the invasion of the nomadic people in the northern northern part, the 300,000 troops of the general Meng Tian and many Labor pushed the original Yan, Zhao, and Qin Great Wall in the north, and and the Qin Great Wall, and and the Qin Great Wall, and and the Qin Great Wall, and the Great Wall of Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, and the Qin Great Wall, Expanded, a Great Wall from the west to east of Liaoning has been built in the west to the east of Liaoning. This is the first Great Wall in Chinese history. In the Han Dynasty, Emperor Hanwu also built a Great Wall of nearly 20,000 miles in order to strengthen the defense. At the same time, this also protects the newly developed Silk Road. With the line of defense, it starts from Xinjiang in the west and east to Liaoning. It is the longest dynasty to build the Great Wall in Chinese history. The Great Wall of the Ming Dynasty is the highest peak of the Great Wall in Chinese history. The project is large, and the essence of technology is unique. At that time, Zhu Yuanzhang adopted the suggestion of "building high walls, extensive grain, and king" in the process of unifying the Ming Dynasty. At that time, although the Yuan Dynasty had perished, it still maintained a relatively complete military strength. In addition, the gradual rising female true tribe continued to invade, so it began to build the Great Wall. The large -scale construction of the Great Wall in the Ming Dynasty has reached more than 18 times. It was basically completed in the end of the Ming Dynasty. From the east, the Tiger Mountain by the Yalu River in Dandong, Liaoning, and the Ming Dynasty Great Wall in the west to Gansu Jiayuguan was 6,350 kilometers. The Ming Great Wall has three characteristics. The structure is complete, the management is complete, and the layout is tight. The Badaling Great Wall we see today is part of the Ming Great Wall. Although the Great Wall's most primitive purpose in ancient my country was defense, it also played other role. The first is the military role, and the second is the economic role. It not only promotes the development of Tuantian and the development of the northern Xinjiang economy, but also the people of the Central Plains to live and work in peace, and the third is to promote the integration of all ethnic groups. In addition, it also protects communication and promotes opening up. It is worth mentioning that in ancient my country, it was not only the experience of building the Great Wall these three times. According to statistics, in the two thousand years, more than 20 vassal states and the feudal dynasties have been built. If the Great Wall is converted into a large wall with a height of 5 meters and a thickness of 1 meter, there are mostly wealthy around the earth. Famous folklore: Beacon show princes and Meng Jiangnv's crying Great Wall also happened on the Great Wall. Today, after several revisions, the Great Wall basically restored its previous appearance. In 1987, it was included in the "World Cultural Heritage List" by UNESCO, and it is still the world in the world. 1,517 Browse 2017-12-15
The design of tour guide words, introducing Henan
Henan Province is located in the central and eastern part of China. Because most areas are south of the Yellow River, it is named "Henan". Henan is also known as "Zhongzhou" and "Central Plains", referred to as "Yu" for short. Henan Province, known as the "epitome of Chinese history and culture", has been the political, economic, and cultural center of China for a long time. Since ancient times, it has said that "the Central Plains can get the world". The three ancient capitals of Luoyang, Kaifeng, Anyang, and the four national historical cities of Zhengzhou, Nanyang, Shangqiu, and Junxian County have many monuments, and they are all over. Luoyang Longmen Grottoes, one of the three major stone carvings of China, Millennium Gusong Deng Feng Shaolin Temple, Tai Chi Township Wenxian Chenjiagou, Oracle Discovery Anyang Yinxu, Zhouyiyuan Tangyin Lili City, Yanhuang descendants to see the ancestral sacred land Hundreds of tourist attractions such as Xinzheng Xuanyuan and Huangdi, the majestic and magnificent Yellow River and small wave bottoms have formed more than 10 golden tourist routes such as ancient capitals, Yellow River Tour, Kung Fu Fitness Tour, Root -Finding Tour, and Three Kingdoms Journey.
4 praise · 386 views
wrote a guide word for Sanya
Sanya is the southernmost city in China and the most famous "international tropical coastal tourist city" in China. Sanya has a long history. The "Sanya" site discovered by archaeological workers in Sanya is the earliest human living site in Hainan Island. The Han Dynasty set up Zhuya County in Yicheng Town, Sanya City. The Sui Dynasty set up Linzhen County. The Tang Dynasty was changed to Zhenzhou. In 1954, the Ya County Government moved from Yicheng to Sanya. It was not until 1984 that it was approved by the State Council to revoke Ya County to set up Sanya. Therefore, as a city, Sanya is very young. This is where many ethnic groups live in. Among the 450,000 people in the city, there are 170,000 Li people, more than 2,800 Miao people, and nearly 7,000 Hui people. In addition to the urban area, Sanya City has jurisdiction over ten towns and three townships, and there are five large state -owned farms. Sanya is located at 18 degrees north latitude, with an average annual temperature of 15.4 degrees Celsius, and there is no frost all year round. When the northern country was frozen and thousands of miles fluttering, in the hot soil of Sanya, it was still red, green, and warm wind. "The overseas scenery is different, and the willow willow flowers at four o'clock. The cold and the summer are unable to meet, and only the peach Fu Fu Yi Yi." The ancients painted the four seasons of Sanya and the beautiful scenery. Because of this, Sanya has become the best resort in the country's best avoidance, winter swimming, and vacation. Sanya is unique, bringing together tourism resources such as sunlight, seawater, beach, climate, environment, hot springs, ethnic style and tropical pastoral scenery. It is one of the most densely dense area of tropical marine tourism resources in the world. Sanya not only the beautiful crown of the tropical coastal natural landscape, but also the rich humanistic tourism resources. Here are the footprints of derogatory officials and monks in ancient times, and there are beautiful and moving myths and folklore. When you are intoxicated with coconut wind and sea rhyme, those legendary history and culture that are linked to the landscape will definitely make you feel emotional and think about it. The main tourism and leisure places in Sanya's tropical coastal include Yalong Bay, Lulu, Tianya Haijiao, Dadonghai, Nanshan, Wuzhizhou Island, etc. Their common features are that not only are they sunny, the beach is white, the coconut wind shakes, the sea charm is charming, but also in a pure ecological environment. The water quality of the offshore waters meets the national first -class seawater standards, and the atmospheric environment is better than the national standard. The results of the third and fourth censuses in the country show that Hainan's per capita life span is the crown of the country, and Sanya is the longest place for Hainan. Sanya's city flowers are Delta. Whether it is a scenic spot or next to the mountain road, you can see a thick green branch and green leaves at will, with clusters of gorgeous red flowers floating. It's right. Sanya's city trees are sour beans. Its torso is huge, the branches and leaves are thick, and the tree is magnificent. However, in Nanshan Cultural Tourist Area, you can see sour peas. Due to the story of "Deer's Back" (we stayed in the introduction of the attraction), Sanya won the other name of "Lucheng". As an international tropical coastal tourist city, Sanya has paid more and more attention to the beauty of the city's appearance. They built the "Coconut Dream Corridor" in the narrow area of 20 kilometers along Sanya Bay, as well as rectifying the Great East China Sea, and the new rainforest square, which is a key project of urban greening and beautification projects implemented in recent years. Coconut Dream Corridor is mainly planting coconut trees, and green grass is paved under the trees. During the intercourse, shrubs and flowers, interspersed entertainment, landscape cultural sketches, forming a combination of viewing, visiting, leisurely, and the fun and vibrant coastal kelp. Park. The first phase of the project has been completed. Visitors can go to the scene and listen to Jingtao, Yi Yue's body and mind.
16 like · 758 Browse 2017-12-16
Writing a guide word
It friends: Hello everyone! Welcome to visit the ancient cultural street of Tianjin. The ancient cultural street built in 1985 added a few colorful to Tianjin City. With its unique "Chinese flavor", "Tianjin flavor", "ancient flavor", and "cultural flavor", it attracted tourists from afar. There is an ancient temple on this street for hundreds of years. It was originally called "Tianfei Palace", which was later called "Tianhou Palace". Tianjin is in the Bohai Sea east, leaning against the capital, and since ancient times, it has been a water and land transportation hub collected by the boat and car. The Tianhou Palace is a temple that sacrifice the sea god heavenly after the development of transportation. The Tianhou Palace was built in the Yuan Dynasty for three years. In 1326, it was soted in the east and west. It is the oldest building in Tianjin. The Tianhou Palace, from east to west, consists of a theater building, a pole, a mountain gate, a tower, the front hall, the main hall, the main hall, the Tibetan Scripture Pavilion, the Qisheng Temple, and the buildings such as the north -south bell, Zhangxian Pavilion, and the Piantian.
13 like · 125 Browse 2017-09-18
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