One of the options for a multiphase power supply system is a three-phase AC system. It has three harmonic EMFs of the same frequency, created by one common voltage source. The EMF data is shifted relative to each other in time (in phase) by the same phase angle equal to 120 degrees or 2 * pi / 3 radians.

The first inventor of the six-wire three-phase system was Nikola Tesla, however, the Russian physicist-inventor Mikhail Osipovich Dolivo-Dobrovolsky made a significant contribution to its development, proposing to use only three or four wires, which gave significant advantages, and was clearly demonstrated in experiments with asynchronous electric motors. In a three-phase AC system, each sinusoidal EMF is in its own phase, participating in a continuous periodic process of electrification of the network, therefore the EMF data is sometimes referred to simply as “phases” ...

It is impossible to turn current into voltage or voltage into current, since these are fundamentally different phenomena. Voltage is measured at the ends of a conductor or an EMF source, while current is an electric charge moving through a cross section of a conductor. Voltage or current can only be converted into voltage or current of a different magnitude, in this case they talk about the conversion of electrical energy (power).

If the voltage decreases during the conversion of electrical energy, then the current rises, and if the voltage rises, then the current decreases. The amount of energy at the input and output will be approximately the same (minus, of course, the loss in the conversion process) in accordance with the law of conservation of energy. This is because the electrical energy A is originally the potential energy of an electric charge ...

The word "duralight" can literally be translated as "durable light" (from English durable light). Indeed, duralight, upon careful examination, turns out to be a transparent polymer flexible cord, inside of which there are lamps or LEDs (LED Duralight), in fact - a strong tubular garland. PVC tube as a frame provides duralight moisture resistance, flexibility, resistance to ultraviolet radiation and physical strength.

A typical LED duralight can operate at ambient temperatures from −50 ° C to + 60 ° C, and the resource for the operating time is limited only by the capabilities of the LEDs - this is tens of thousands of hours. Inside, the cord is by no means hollow; the gaps between the LEDs are also filled with PVC to give duralight extra strength. So, duralight can be safely used in outdoor and indoor advertising structures, in a variety of architectural lighting, for decorating trees ...

By the thermal action of an electric current is understood the release of thermal energy during the passage of current through a conductor. When a current passes through the conductor, the free electrons forming the current collide with the ions and atoms of the conductor, heating it.

The amount of heat released in this case can be determined using the Joule-Lenz law, which is formulated as follows: the amount of heat released when an electric current passes through a conductor is equal to the product of the squared current, the resistance of this conductor and the time it takes for the current to pass through the conductor. Taking the current in amperes, the resistance in ohms, and the time in seconds, we get the amount of heat in joules.And given that the product of the current and resistance are the voltage, and the product of the voltage and current is the power, it turns out that the amount of heat released in this case is equal to the amount of electrical energy transferred to this conductor ...

In the design of apartments, plasterboard constructions are used in order to create a beautiful interior in the rooms. False ceiling is one of the types of such solutions. There is another variety - stretch ceilings. This is an elastic fabric stretched at a distance from the main ceiling. And the appearance of the design can be absolutely anything, both monochrome and with colorful prints. But lighting still remains a necessity in every room. In this article we will talk about the choice of lighting fixtures for suspended ceilings.

To begin with, stretch ceilings are a canvas stretched on a supporting structure at a small distance from the main floor. The canvas can be fabric or PVC. It should be noted that the PVC film does not withstand high temperatures. 80 degrees Celsius will already be critical. Therefore, in fact, the film normally transfers heat of 40-50 degrees. The fabric canvas is more resistant to temperature ...

In 1202, the Italian mathematician Leonardo Fibonacci published his work under the title “Book of Abacus” (“Book of Calculations”), in which he also described number series immortalized by his name. In one of the chapters, Fibonacci tries to mathematically show how the number of rabbits will increase. He considered the following hypotheses as conditions: for the first two months a pair of rabbits does not produce offspring, starting from the third month a pair of rabbits gives another pair of rabbits.

As a result of constructing a pattern of growth of the rabbit population, we obtain the following series of numbers, noting the increase in the number of rabbits every month: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 ... 1 + 1 = 2; 1 + 2 = 3; 2 + 3 = 5; 3 + 5 = 8 ...If you carefully look at the bump, you will see that its surface consists of scales that are twisted in a spiral in accordance with the Fibonacci sequence. While in a pineapple or in a flower of a sunflower, they are visible to the naked eye ...

Sockets are in every apartment, and they are used many times a day, they connect electrical appliances. Sometimes situations arise when you need to replace the outlet, transfer it, or simply remove it for the duration of repair and wallpapering. Although this is not difficult to do, safety precautions must be followed to avoid electric shock. In this article, we will look at how to remove a wall outlet and disassemble it.

To carefully dismantle the outlet, you need to know its device. It differs depending on the specific model and manufacturer, but, in general, the design is the same. Sockets are built-in and overhead. The built-in ones, as the name implies, are located inside the wall in the recess, and the invoices are fixed outside. Often overhead sockets are used if external wiring is laid or on thin walls, partitions, on furniture elements. The socket consists of four main parts.In the wall or in the socket, it is attached by the legs ...

It is not always possible to find structured, relevant information. In this regard, in 2019, the publishing house “Science and Technology” (SPB) published 3 books for electricians. "Electrics for the curious." “Modern power grid. Workshop electrician. " Book + video course on DVD. Author - Stern M.I. “Modern power grid. New technical solutions. " Book + video course on DVD. Author - Stern M.I.

The first book, Electrics for the Curious, is aimed at schoolchildren, students, and other people who want to get to know the world of electricity for general development or become an electrician in the future. The book is divided into two main parts - theory and practice. The theoretical part is brief, it includes the basic concepts of electricity and electrical circuits, laws and information about electrical engineering in general, in general, the necessary minimum knowledge for an electrician ...