Any electrical equipment is created to work with a certain electrical energy, depending on the current and voltage in the network. When their value becomes larger than the designed norm, an emergency mode occurs. To prevent the possibility of its formation or to eliminate the destruction of electrical equipment, protection is called upon. They are created under the specific conditions of an accident.

The insulation of the household electrical network is calculated on the limit value of the voltage slightly above one and a half kilovolts. If it grows more, then a spark discharge begins to penetrate through the dielectric layer, which can develop into an arc that forms a fire. To prevent its development, they create protections that work according to one of two principles: disconnecting the electrical circuit of a house or apartment from high voltage, removing dangerous potential overvoltage ...

Often in everyday life, a situation arises when the voltage in the network is unstable, or, as they say in common parlance, the light blinks. This phenomenon not only causes discomfort, but can also lead to the failure of home electrical appliances, especially those that are sensitive to voltage surges. Therefore, it is very important in a short time to find the cause of this negative phenomenon and eliminate it. In this article, we will try to understand why the light blinks, and we will present the appropriate solutions to this problem.

One of the most common reasons that a light may blink is poor power supply. In this case, we are talking about an unstable voltage, the value of which changes stepwise. But also do not forget that the reason why the light may blink can also be a malfunction of a lamp or other household appliance that worked in an uncharacteristic ...

In the life of every person at one or another stage of life, the question arises of choosing a profession. This article is dedicated to those who have chosen the profession of electrician from many different areas of activity. How to become an electrician? We will try to answer this question by considering all aspects of this profession.

Many people have shown interest in this profession since their school years. Someone followed in the footsteps of relatives, but someone just likes everything related to electricity - there are many options. You can master this area of ​​activity, like any profession, always. Not all electricians have become such from the very beginning, for many people, the profession of an electrician can be second, third, etc. in life, as the case may be. But in any case, an electrician is not just a person who has received an education, this is a person whose soul lies in this profession, for whom to be an electrician is not just work ...

What determines the long-term permissible cable current? To answer this question, we will have to consider transient thermal processes that occur under conditions when an electric current flows through the conductor. Heating and cooling a conductor, its temperature, connection with resistance and cross-section - all this will be the subject of this article.

The figure shows the graphs of the current and temperature in the conductor over time. From time t1 to time t3, current I flowed through the conductor. Here you can see how, after turning on the current, the temperature of the conductor gradually rises, and at time t2 it ceases to increase, stabilizes.But after turning off the current at time t3, the temperature begins to decline gradually, and at time t4 it again becomes equal to the initial value (T0). So, we can write the heat balance equation for the conductor heating process ...

Where can a beginner start mastering electronics? First of all, from a book, then moving on to practice, this can only be said by someone who does not yet know about the existence of the Electronics for Beginners set from Amperka LLC. The "Electronics for Beginners" set, which includes an electronic version of the book and an extensive set of electronic components, will allow a beginner to not only immerse himself in a boring theory, but will make it possible to immediately begin to implement the practical schemes that are given in the book, and the components for which are included in set.

The Electronics for Beginners set is sold in two parts, each of which contains all the necessary electronic components for assembling practical circuits and conducting the experiments described in the book by Charles Platt, which served as the basis for creating this educational set. The book in electronic form can be downloaded ...

When connecting a private house or apartment to electric networks, there is no question of whether to make sealing of the meter or not - this is a mandatory procedure, without which it is impossible to connect to electric networks. Therefore, if you need the first connection or connection after the suspension of power supply services (for example, due to violation of the terms of the contract), the question arises of the need to seal the meter. What is a filling, and for what purpose is it performed?

Sealing an electric meter is the installation of a special seal on an electric meter, which prevents opening the case and, accordingly, undesirable manipulations with the meter and other elements of the metering panel from the point of view of supplying the organization. The seal is installed exclusively on a working, verified metering device ...

The traditional way to get rid of excess energy released in frequency converters during braking of asynchronous motors controlled by them was to dissipate it in the form of heat on resistors. Braking resistors were used wherever there was a high inertia of the load, for example, in centrifuges, on electric vehicles, on load stands, etc.

This solution was necessary to limit the maximum voltage at the terminals of the converters in braking mode. Otherwise, the frequency converters would fail, because it would be impossible to control the parameters of acceleration and braking. Braking resistors did not burden the equipment economically, but some inconveniences invariably entailed. Resistors are dimensional, they are very hot, they need protection against moisture and dust. And all this is connected only with what needs to be dispelled ...

Comfortable living conditions for a modern person provides hot water. In urban conditions, it is centrally supplied by utilities. Residents of rural areas, summer residents, owners of private houses quite often have to deal with this issue on their own. For them, the industry produces numerous designs of water heating units, which differ in design, performance, operating conditions. Most of them have the name "boiler".

Under this term, it is customary to understand a boiler with a coolant, which is heated inside the structure or from its external side. An indirect type boiler works due to a heat source located outside its body when the temperature is transferred to the heat carrier circulating through the coil built into the inside ...