Already in 2007, in one of the reports at the Beijing Conference of the International Commission on Lighting, the importance of economy and environmental friendliness of both already used and still being developed, more advanced lighting products was emphasized.

The primary accent was made by the speakers on a more rational and efficient use of light. And this was not at all a call to somehow reduce the illumination. As one of the most important steps towards this goal, the development and implementation of energy-efficient and more environmentally friendly light sources - LEDs - is highlighted. LEDs are semiconductor electrical products designed to receive light due to the electric current passing through the pn junction. But not every pn junction emits light. To receive light from a semiconductor, it is necessary ...

Almost all technologies, although they tend to develop, eventually become obsolete. This pattern did not bypass silicon electronics. It is easy to notice that in recent years its progress has slowed significantly and generally changed the direction of its development.

The number of transistors in microchips no longer doubles every two years, as it was before. And today, computer performance is increasing not by increasing their operating frequency, but by increasing the number of cores in the processor, that is, by expanding the capabilities for parallel operations. It's no secret that any modern computer is built of billions of small transistors, which are semiconductor devices that conduct electrical current when a control signal is applied. But the smaller the transistor, the more pronounced spurious effects and leaks ...

When installing external wiring or laying some kind of information cable, it is advisable to immediately take care of how best to hide these wires. To solve this problem, special cable channels or plastic boxes are well suited.

Unlike the cable tray, the cable channel or box has a cover, so that the cable in it is closed. In addition, these products are produced today for every taste and color, come in various shapes and sizes, so that anyone who thinks about installing external wiring can choose a cable channel or box that is ideal for certain conditions of home, office or production the interior. The most common are plastic and metal cable ducts made of PVC and aluminum, as well as stainless steel. For administrative and industrial premises are best suited ...

A rectifier is a device for converting AC voltage to DC. This is one of the most common parts in electrical appliances, ranging from a hair dryer to all types of power supplies with an output DC voltage. There are different schemes of rectifiers and each of them to a certain extent copes with its task. In this article, we will talk about how to make a single-phase rectifier, and why it is needed.

A rectifier is a device designed to convert AC to DC. The word "constant" is not entirely correct, the fact is that at the output of the rectifier, in the circuit of a sinusoidal alternating voltage, in any case there will be an unstabilized pulsating voltage. In simple words: constant in sign, but varying in magnitude.Stabilized is a voltage that does not change in magnitude regardless of load ...

Most electrical installations are always earthed using a special ground wire. The ground wire is designed to connect the conductive elements of the installation to the ground, which initially has zero potential, and thereby create a safe zero potential on the grounding element. The main purpose of the ground wire is to protect a person from electric shock if the phase voltage supplying the unit for some reason gets on its case.

An example is a washing machine, in the wiring of which the insulation is damaged over time and the bare phase wire at some point touches its metal case of a household appliance. In this case, a person is at risk, because if he touches the car’s body, he will get an electric shock, because current will flow through his body in the direction of the earth, but the person is practically on the floor, which is not always securely isolated ...

Sometimes many of us have to deal with the problem of a breakdown or accidental breakage of the connector from the Internet cable. As such a cable, a twisted pair cable is used today, consisting, as a rule, of four pairs of twisted copper conductors having an individual color marking of insulation.

A twisted pair cable is traditionally used to transfer signals between a router or modem and a computer, or simply between computers, since it is ideal for this, and to a sufficient extent allows you to prevent interference from various external sources to the transmitted signal. Let's talk about how to properly squeeze a couple, how to properly attach a new connector to it. Violation of the health of the connector is a frequent phenomenon. We transfer modems and routers, make a rearrangement in the apartment, rearrange the computer, accidentally touch the loose cable with our foot ...

The world's first thermoelectric material based on ordered nanotubes was developed by a group of scientists from the Department of Functional Nanosystems and High-Temperature Materials of the National University of Science and Technology “MISiS” in collaboration with researchers from the Swedish University of Technology Lulelo and the Jena University named after Friedrich Schiller. Information on innovative development was presented in the form of an article in the journal Advanced Functional Materials.

The new material has a polymer nature, so it is flexible. In addition, an additive made of nanotubes was used here, which greatly improves its electrical conductivity. The prospects for the material are colossal. In principle, it is applicable for charging mobile gadgets without the need for other traditional energy sources. A bracelet or case for a smartphone made of new material will allow you to charge small portable devices ...

In electrical engineering, it makes no sense to simply say “electricity”. Here it is always necessary to specify what exactly is being discussed. We can mean the electric charge of the capacitor, the voltage in the socket, the current flowing through the wires, or for example the power that the electric meter in our apartment wound in a month.

In any case, there is no such quantity as electricity, there is the quantity “quantity of electricity”, correctly called the electric charge, which is measured in pendants.This is an electric charge - it moves along the wires, accumulates on the plates of the capacitor, is periodically present at the terminals (minimum - on the phase wire) of the socket, moves in the form of current when the electric network performs work. The main electrical quantities are somehow related to the charge. We will talk about these values ​​today. Voltage is measured between two points in a circuit ...

At all times, mankind understood that day is necessarily the sun, and night is certainly darkness. Until the beginning of the twentieth century, for most people it was considered absolutely normal to work on the street during the daylight hours, while daylight illuminates everything around. But as soon as dusk came, everyone went home, and at night they went to bed.

Today everything has changed. Most people in the so-called civilized countries work in rooms with artificial lighting, and when the sun goes below the horizon, the more they turn on artificial light to work longer, stay awake, and go to bed later. Initially, people used fire to illuminate indoors: lamps, candles, torches. Later appeared oil, kerosene and gas lamps, and finally, the first electric lighting fixtures ...

At the end of 2018, the Digital Economy program was approved, according to which it is planned to deploy an internal infrastructure for collecting, processing, storing and providing data in Russia. This means that in the coming years the number of specialized data centers or data processing centers (DPCs) will increase in the country, and the demand for the electrification of such facilities will increase.

The main difficulty is that domestic standards for power supply of data centers are under development (now experts use the American standard TIA 942 and PUE). The construction of data centers in Russia is developing, but despite the growing experience in this area, engineers are faced with rather difficult issues. The TIA 942 standard identifies four levels of data warehouse reliability: Tier I, II, III, and IV. The first two are considered not very reliable, so they are not used for more or less large data centers ...

Any activity requires constant development, and wiring is no exception. It is important to constantly expand our professional horizons, especially regarding the equipment and materials used. We offer several facts about electrical engineering that will make any specialist think.

According to the Electrocable Association, every eleventh product on the low-voltage equipment market is fake. They copy everything, but the saddest thing is with cable and wire products (CAT) and circuit breakers. When choosing this equipment you need to be especially careful. So, in counterfeit cables, the cross section of copper conductors is underestimated, the content of copper can be significantly reduced in obviously poor-quality products. In order to choose the right cable of the desired cross section, you need to take into account the rated current and power of the devices ...

With electrostatic induction, an electric charge appears on the surface of a conductor introduced into an external electrostatic field. This charge, which accumulates on the surface of said conductor, is called an induced or induced charge. Moreover, on the opposite sides of such a conductor, the induced charges will be of the opposite sign - on the one hand there will be positive, on the other - negative.

The accumulation of charge on the surface of the body during electrostatic induction will occur until the intrinsic electrostatic field of this body almost completely compensates for the external electrostatic field in which this body is placed. This happens with bodies with high conductivity, that is, with metals characterized by low resistivity. The phenomenon of electrostatic induction finds application in the technique of ...