Electric current has one distinguishing feature: it is able to flow only in a closed loop. If this chain is broken, then its action immediately ceases. This property is embodied in the work of maximum current protection, based on the use of fuses and circuit breakers.

They are selected in such a way that they can withstand the nominal value of the current flowing through them for a long time. This ensures the reliability of power supply to consumers. At the same time, fuses and circuit breakers have protective functions: during emergency conditions in a controlled circuit, they break the dangerous current passing through them. At the same time, two factors are taken into account in the complex: the magnitude of the flowing load current, the duration of its impact. The fuse fuse blows out from the heat created by the current passing through it ...

When choosing a cable underfloor heating as the main or additional heating system, it is first necessary to determine the power of the heating cable of this system. It is very important to perform the correct power calculation so that the installed heating system functions correctly and fully complies with the requirements that apply to it.

There is no single rule by which it is possible to calculate the required power of a heating cable for a warm floor. When calculating the power, it is necessary to take into account several factors that significantly affect the functioning of the warm floor. Therefore, the first step in the calculation will be the refinement of the source data: The required degree of heating of the rooms. In this case, it is necessary to clarify for what purposes a warm floor is used - as the main heat source or as an additional or backup ...

The Walt Disney Company, known worldwide for its cartoons and films from Disney Studios, interacts extensively with various laboratories as part of Disney Research's informal collaboration. So, most recently, the company's engineers created a prototype of a room in which various electronic devices can be charged wirelessly.

The project of the room implements QSCR technology - Quasistatic Cavity Resonance, which translates from English as “quasistatic cavity resonance”. This technology involves the wireless supply of energy inside the volume of a single room, so that mobile devices inside the room could be charged without cable. According to the engineers, in the future offices will be equipped with such charging technologies. Typically, a person, to charge a tablet, phone or other electronic gadget, has to look for an outlet ...

Recently, the implementation of the ideas of a smart home is in great demand. There are many different solutions that allow you to automate various processes, to make more convenient and efficient operation of household electrical appliances, both in the apartment and in a private house. One of these solutions, which can significantly simplify life, is the use of a weekly electronic timer, which will be discussed in this article.

Weekly electronic timer - a device designed to turn on and off the load (household appliances) at a specified time, with a set frequency.From the name of the device it follows that such a timer differs from the usual daily timer in that it can operate for several days, weeks. You can set the desired settings for each day of the week individually. Just set the timer once ...

After people began to use the energy of electricity to perform useful work, they immediately ran into questions of getting electrical injuries from burns that occur when exposed to electric current. For example, back in 1753, on July 26, professor of the St. Petersburg Academy of Sciences Georg Wilhelm Richter, while conducting experiments with atmospheric electricity, died from contact with ball lightning. After this incident, such studies were immediately suspended, and the causes of what happened began to be studied.

Almost all the leaders did this after each accident to study the causes of its occurrence. As a result of the collection of accident statistics and their detailed analysis, recommendations were developed on the safe behavior of people in order to maintain their health and ensure the normal operation of the equipment. Over time, they were legally issued the requirements of the rules and regulations ...

As you know, induction motors have a three-phase winding (three separate windings) of the stator, which can form a different number of pairs of magnetic poles depending on their design, which in turn affects the rated engine speed at the rated frequency of the supply three-phase voltage. At the same time, the rotors of this type of motor may differ, and for asynchronous motors they are short-circuited or phase. What distinguishes a squirrel-cage rotor from a phase rotor - this will be discussed in this article.

Ideas about the phenomenon of electromagnetic induction will tell us what will happen with a closed coil of a conductor placed in a rotating magnetic field, similar to the magnetic field of a stator of an induction motor. If such a coil is placed inside the stator, then when a current is supplied to the stator winding, EMF will be induced in the coil ...

The basis of the electric motor, both direct current and alternating current, is based on Ampere force. If you do not smother how it turns out, then nothing will ever be incomprehensible. In fact, there is a vector product and differentials, but these are details, and we have a simplified, special case. The direction of the ampere force is determined by the rule of the left hand. Mentally put the left palm on the upper figure and get the direction of Ampere forces. She type stretch the frame with the current in that position as shown in the picture. And nothing will turn around here, the frame is in balance, stable.

And if the frame with the current is rotated differently. There is no equilibrium here already, the Ampere force unfolds the opposite walls so that the frame begins to rotate. Mechanical rotation appears. This is the basis of the electric motor, the very essence, then only the details. What will the frame do ...

Alternative energy specialists have long formed a stereotype regarding how correct and efficient wind generators should look. This state of affairs is not at all surprising, because wind generators are built every year around the world, and these are always huge structures with blades, similar to giant windmills. As for the vaneless wind generators, the attitude towards them, as a rule, among alternative people is very, very skeptical.

Nevertheless, the developers of new solutions are in no hurry to stop in their enthusiasm.And so, in 2015, the Spanish company Vortex Bladeless proposed a new version and a ready-made solution model, showing how wind generators can be arranged that are not inferior in efficiency to traditional blade ones, but surpassing them both in safety and in production efficiency ...