Justification of the choice of the profession of an electrician, based on personal experience, official statistics and the results.

Every time dictates not only fashionable clothes, but also fashionable professions. At the beginning of the last century, in the era of the GOELRO plan, electricians were worth their weight in gold and were admired as fairy-tale heroes. But "... Times do not choose, they live and die in them." and in our time there is only one very “popular” red electrician Chu. Thanks to his efforts, according to experts, the industry rolled back fifty years ago.

From year to year, the sphere of higher education spits out a huge number of economists, lawyers, artists, managers of various kinds on the labor market, but at the moment there are sorely lacking engineers and electrical engineers in particular. We need technical specialists with experience in the profession. Engineers and workers, the prestige of the profession of the latter is especially underestimated ...

What are photosensors? In various electronic devices, automation devices, photosensors are used very widely. Anyone who has ever disassembled an old computer mouse, as it was called a “komovskaya,” with a ball inside, must have seen wheels with slots spinning in the slots of the photosensors. Such photosensors are called photo interrupters - they interrupt the flow of light.

On one side of such a sensor is a source - an LED, as a rule, infrared (IR), on the other a phototransistor (to be more precise, two phototransistors, in some photodiode models, to determine the direction of rotation). When the wheel is rotated with slots at the output of the photosensor, electrical impulses are obtained, which is information about the angular position of this wheel itself. Such devices are called encoders. Moreover, the encoder can be just a contact ...

Mobile electronics every year, if not a month, is becoming more accessible and widespread. Here you have laptops, and PDAs, and digital cameras, and mobile phones, and a ton of all sorts of useful and not so devices. And all these devices are continuously acquiring new features, more powerful processors, large color screens, wireless communications.

Conventional rechargeable batteries and batteries are clearly not enough to power the latest achievements of the electronic industry for any substantial amount of time. And without reliable and capacious batteries, the whole meaning of mobility and wirelessness is lost. So the computer industry is working more and more actively on the problem of alternative power sources. And the most promising, by far, direction here are fuel cells. The basic principle of fuel cell operation has been discovered ...

Contact connections are a very important element of electrical work, because the reliability of any electrical installation is largely determined by the quality of the electrical contact.

All contact joints are subject to certain technical requirements, including electrical parameters, design, good resistance to mechanical factors, reliability and safety. This collection contains the best articles on the site bgv.electricianexp.com, which discusses the main ways to create high-quality connections and branches of wires and cable cores in electrical installations.

At the point of contact of the two conductors, a transition resistance of the electrical contact occurs, the magnitude of which depends on a large number of factors: the physical properties of the materials in contact, their condition, the compression force at the contact point, the heating temperature ...

Single-phase motors are electric machines of low power. In the magnetic circuit of single-phase motors there is a two-phase winding, consisting of the main and starting windings.

Two windings are needed in order to cause the rotation of the rotor of a single-phase motor.The most common motors of this type can be divided into two groups: single-phase motors with a starting winding and motors with a working capacitor.

For engines of the first type, the starting winding is switched on through the capacitor only at the time of starting and after the engine has developed a normal rotation speed, it is disconnected from the network. The engine continues to work with one working winding. The value of the capacitor is usually indicated on the nameplate of the motor and depends on its design. Single-phase AC induction motors with a working capacitor have an auxiliary winding ...

For many people, a computer is not only a home entertainment center, but also a tool to make good money. First of all, these are, of course, programmers. People of other professions are not without a computer: writers, translators, architects, designers, designers, accountants, and even musicians. This list is probably endless these days.

In the workshop of a radio amateur, the computer is not the last place. First of all, it is a repository of various literature, which used to occupy a lot of space in a bookcase. Working with books and magazines has become much easier and faster: the right book or article is in seconds. And what about online libraries!

If it’s not possible to solve a technical issue on its own, then you can "go" to the Internet forum of radio amateurs and solve the problem ...

To begin with, who are hams. Amateur radio, as a mass phenomenon, arose along with the appearance in life of the first radio receivers in the twenties of the last century: many were interested in what was inside and how it worked. In fact, a radio amateur is an engineer without a diploma.

In the first part I talked about the development of the element base of radio electronics, and along the way, about the development of computers. This article is a story about the construction of an amateur radio workshop, about the tools, materials and measuring instruments that are used by amateur radio enthusiasts in their practical activities. The article is intended mainly for beginner hams. I would be glad if this article is useful to readers of the site!

If you decide to engage in amateur radio, then the legitimate question arises, but where do they deal with, where to place the smallest workshop? There are many answers to this question ...

In 1898, in the illustrated weekly journal The Journal of Newest Discoveries and Inventions, an article was published entitled Home-Based Wireless Wiring Experiments. The transmitter was made on a Rumkorf coil, and the receiver, in fact, was very similar to A.S. Popova. Using the described receiver and transmitter, it was possible to transmit a signal at a distance of up to 25 m, which for that time was a huge achievement.

Already in 1924 the first issue of the radio amateur magazine was published. The first post-war issue of the magazine was published in January 1946. It was from this January issue that the magazine began to be called Radio.

The most striking thing about this issue is that after the circuits of the detector receivers, the color marking of the resistors is given, as it is today! True, it also says that this is an American marking ...