Electric installation work. Schemes, articles of the Free Technical Library

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Electric installation work. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Electric installation work

We recommend reading in our Free Technical Library:

How to build a 2,4 GHz antenna

Antenna section. Theory. More than one year has passed since the time when I found out that a home local network was registered across the street from me, uniting almost 100 computers today. Of course, connecting to it has become perhaps my most obsessive idea, however, given that the nearest house, which this network combines, is at least 100-150 meters, plus tram tracks and the roadway make up a considerable hindrance, to run a cable , even in a good stretch, it is simply not possible ... >>

Propagation of radio waves

Section Beginner radio amateur. In conclusion, it must be said that radio waves of different ranges have unequal properties that affect the range of their propagation. Waves of one length travel long distances, waves of another length are lost beyond the horizon. It happens that the radio signal is perfectly audible somewhere on the other side of the Earth or in Space, but it cannot be detected a few tens of kilometers from the radio station. If we tuned the receivers to nearby radio stations operating in the ranges of ultrashort, short, medium and long waves, then, moving away from the stations, we could observe the following phenomenon: already a few tens of kilometers away, the reception of ultrashortwave and shortwave stations would stop, after 800- 1000 km would stop hearing the transmissions of the medium-wave station, and after 1500-2000 km - and the transmissions of the long-wave station ... >>

Technical characteristics of protective and disconnecting devices for mobile and portable current collectors

Electrical section. Protective disconnecting devices are designed to protect against electric shock people working with AC electrical installations. Currently, a large number of protective shutdown schemes have been developed. In networks with grounded and isolated neutral, it is possible to use protective shutdown devices of the ZOUP-25 type, designed for a consumer current of up to 25 A at a voltage of 380 V, the protection setting is 10 mA, the shutdown time is 0,05 s, the weight is 4,5 kg . When working with power tools of single-phase current with a total power of 0,5 kW at 220 V, ZOU-1 protective shutdown devices are used. For electric welding, the device of the USNT-4 type is the most promising. When connecting a three-phase motor to a single-phase network using capacitors, it must be taken into account that the rated voltage of capacitors of the KBG-MN and BGT types is given for their operation at direct current ... >>

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Articles on electrical work

Articles on electrical work; descriptions of electrical works: 61 articles

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Regulatory documentation for an electrician

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Purification of water and soil from cadmium 22.05.2022

Chinese scientists have found a new way to purify water and soil from cadmium using an iron-based magnetic carbon microsphere obtained by joint hydrothermal treatment of iron waste and liquid tobacco waste.

With the rapid development of metallurgy, galvanization, dye and battery production, mining and other industries, the problem of cadmium pollution is becoming more and more serious.

The study was led by Wu Zhengyan from the Institute of Intelligent Mechanisms of the Chinese Academy of Sciences and Cai Dongqing from Donghua University. As a result, a new method was found for treating water and soil contaminated with cadmium, as well as a new method for disposing of liquid waste from the tobacco industry and iron waste, which can pollute the environment.

During the scientific work, which lasted about a year, it was calculated that 12 tons of iron-based carbon microspheres obtained from 10 tons of iron waste and 20 thousand liters of liquid tobacco waste could be used to purify 120 thousand liters of water from cadmium with concentration of 10 mg per litre.

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