1, the four major pollution of contemporary society White cloud wireless charging coil : Noise pollution, water pollution, air pollution, solid waste pollution. From the physical point of view, noise refers to the sound made by the sound body to do random and disorderly vibration . The Angle noise of environmental protection refers to the sound that interferes with people's normal rest, study and work, and the sound that interferes with the sound that people want to listen to.
2, invariants in physics: density: is a property of matter, and has nothing to do with the mass and volume of the object. Specific heat: A property of a substance that does not change with the heat, mass, or temperature absorbed by the substanceclose. Calorific value: is a characteristic of the fuel, and has nothing to do with the combustion of the fuel, the mass, and the amount of heat emitted.
3, human education version of junior high school physics current and circuit knowledge summary Fifth chapter "current and circuit" knowledge summary charge ① charged (charge) : the friction of the object has the nature of attracting objects of light small objects, white cloud wireless charging coil We say that the object with electricity (charge). ② triboelectrification phenomenon: the phenomenon that the friction object attracts the light and small object ③ two kinds of charges: there are only two kinds of charges in nature. Positive charge: rubbed with silkThe electricity carried by the glass rod.
4, physical meaning: It means that the mass of 1 kg water temperature rise 1℃ heat absorption is 2×103 coke. 5. Heat calculation: Q =cm △ t decreased Q absorption =cm △ t increased Q is proportional to c, m, and △ t, and is inversely proportional between c, m, and △ t. △ t=Q/cm Internal energy: The sum of all sums in a body. All bodies have internal energy. Internal energy unit: Joule The internal energy of a body is related to its temperature. As the temperature of the object increases, the internal energy increases. Lower temperature decreases internal energy.
5, and to the third grade total review time, junior high school physics knowledge point is relatively speakingCompare the basics. The following Baiyun wireless charging coil I sorted out the physical error prone knowledge points for your reference. The speed of light in vacuum: c=3×108m/s=3×105km/s (the speed of electromagnetic wave is also this). In the description of the reflection law, we must first say reflection and then incident (plane mirror imaging also says the order of image and object...).
6, the third day of physics and electricity review outline in the third day of electricity in the high school entrance examination accounted for a considerable proportion (35%~45%), if not fully grasp then to get high marks in the high school entrance examinationCharging coil Cadillac, since then this brand has left a deep impression in my mind. After many years, I finally had the opportunity to own a Cadillac of my own. 2, the big butt to us, the logo looks very advanced, I asked my brother-in-law, this car should be very good, my brother-in-law said, this is Cadillac, should be more than 1 million, this is the first time I know Cadillac, at that time of car ignorance of me, Cadillac this brand is deeply branded in my heart a mark, In the future, when I met the Cadillac car, I could not help but take a look at it, thinking, WhenTo have a Cadillac of my own.
3, next is X3, the new X3 appearance is very good, is also just listed in the new car, sitting inside the sense of full movement, the sense of control BMW absolutely no say, but the back row space is still not large enough, and the new car is listed, the incentives are not strong, no fate, goodbye.
4, finally between Volvo and Cadillac, Volvo XC60 car is also very good, but its voluptuan butt I really can not accept, finally determined Cady, this car atmosphere, good sense of science and technology, the appearance looks imposing, 2020 engine has closed cylinder technology,It should feel good with a 9-speed transmission. That's it! Buy a car Baiyun wireless charging coil : Decide XT5, the next step is the car home and other major forums, mobile APP fully understand the configuration and price.
1, incandescent light deeply rooted in people's hearts, has a large number of inventors devotedTo the improvement of the incandescent lamp. In fact, before the birth of carbon filament incandescent lamps, people tried to use a variety of refractory metal filament, and after the advent of incandescent lamps, people seek the ideal state of the filament is sparing no effort. Finally in the 9th year of the 20th century, the American Corich found a filament material with excellent performance - tungsten. 2, the advent of arc lamp has opened up a new era of electrical lighting, and has a great significance in the history of human lighting. Because of its strong luminosity, high luminous efficiency and good color rendering, arc lamp has incomparable advantages in the fields of printing and platemaking and film projection, until todayStill occupies a place. However, the power consumption of electric candles is large, the life is short, and harmful gases are produced, so after the emergence of incandescent lamps, it has almost disappeared in the field of lighting.
3, cover lamp as the name suggests, the use of lamp shade to cover the light, and then fixed projection in a certain area. Generally used in the ceiling, bed, cabinet interior. You can hang it, you can land it. In the style, there are many kinds of cylindrical, tube, flowerpot, concave trough and under light wall lamp. It has a variety of uses, can be lighting, but also can create special light and shadow effects. Under normal circumstances, the wattage should not be too large, more convenient to create softThe indoor environment. 4, there are many kinds of lantern in the Lantern Festival, or image lamps prepared according to the image of things, such as dragon lanterns, tiger lanterns, rabbit lanterns, etc., or activity lamps prepared according to folk stories, such as cocowboy and Weaver, twenty-four filial piety, etc., to show the national spirit of loyalty, filial piety and integrity. All kinds of lanterns are skillfully made, showing the wisdom and skills of artisans. With the development of The Times, the Lantern Festival is more and more grand, the national characteristics are more and more concentrated, and the time of the Lantern Festival is longer and longer.
5, the Lantern Festival, also known as the Yuan Festival, Yuan night, Lantern Festival. Chinese traditional festival, every year on the 15th day of the first lunar monthIt's this section. According to the Han tradition, on this bright moon night, people point thousands of colorful lights to celebrate. Go out to enjoy the moon, burn the lamp, guess lantern riddles, eat yuanxiao, family reunion, celebrate the festival, happy.
3Edison's story: Kicked out of school: In 1855, he began to go to school, the school has only one class, the principal and teacher are Mr. Engel. Because Edison has the nature of inquiring questions, in class often often ask the teacher some alternative questions, in just three months, the teacher was expelled from the school in the name of "imbecile".
1, the safety inspection of high and low voltage distribution room mainly includes: high and low voltage cable lines and Bridges, high voltage cabinets, highPressure ring network cabinet, transformer, low voltage distribution cabinet, capacitance compensation cabinet, distribution room environment, etc. The main content is subdivided as follows: high and low voltage cable lines and Bridges For high and low voltage cable circuits, it should be checked whether the bridge is tightly fastened, whether the anti-rat blocking is firm, the high and low voltage cable bridge should be intact and not damaged, and any anomalies should be handled in time and recorded.
2, the indoor and outdoor environment is clean, the items are placed neatly and orderly, no debris and unrelated items are stored. Whether there is a power safety management system, whether there is a full-time electrician, whether the electrician has a valid certificate to work (electrician certificate, electrician license into the network is within the validity period). Whether periodicCheck and maintain records. There is no switch room management identification plate.
3, check whether the transformer is not damaged, the nameplate is intact and clear, tighten the cover screw, in order to reduce the noise caused by vibration of the cover when the transformer is running. Check whether the high and low voltage side is in good contact with the cable or bus bar connection, tighten the connection bolts, clean the rust, ablation and pollution of the bus bar lap surface, and replace the rusty bolts and gaskets. Tighten the setting screws of the voltage regulation coupling and deal with rust.
4, check whether the circuit breaker, electromagnetic core suction is normal, there is no coil overheating or excessive noise. Bus insulation clampWhether there is damage and skew, and whether the fixing screw of the bus clamp is loose. The electrical surface of the power distribution cabinet is clean and the ground connection is normal. Whether the doors and Windows of the distribution room are intact, whether the doors of the distribution cabinet are complete, and whether the roof is leaking water in rainy days.
5, [Daily inspection of high and low voltage distribution room precautions] Xiangtai electric tips inspection needs to pay attention to the temperature of the distribution room, the temperature of the transformer, whether the transformer has abnormal sound, the abnormal smell in the distribution room, whether the wiring terminal is red, the insulation tube is burnt, and so on are all places that need attention in the distribution room at all times. Here are some more specific rules. Not allowed to orderPersonnel on duty are not allowed to participate in maintenance and other work.
6, if the transformer is indoors, it belongs to high voltage, if the transformer is outdoors, it belongs to low voltage. Equipment technical parameters and number: the switch model inside your distribution cabinet, such as an air switch model DZ20Y-225/3300, should fill in the distribution room duty and regular inspection system according to the actual model of your equipment: nothing more than some rules and regulations such as what you want, what is not allowed, what is strictly prohibited.
This may be the most controversial invention of his life, but it is alsoHis greatest contribution to humanity is the invention of the Tesla Coil, a free energy technology capable of providing unlimited power. Perhaps you have never imagined that as early as more than 100 years ago, mankind was already able to enjoy free electricity. Unfortunately, as in the past, Tesla encountered "Edison" unreasonable attack, his invention once again violated the interests of some self-interested businessmen.
His lifetime of inventions are numerous, such as: in 1882, he followed "Edison" invented direct current (DC) shortly after the invention, that is, invented alternating current (AC), and made the world's first alternating currentGenerator, and the invention of multiple transfer of electricity technology. In 1895, he built a generator set for the US Nicaragua Power Station, which is still one of the world's most famous hydropower stations. In 1897, he made Marconi's theory of "wireless communication" a reality.