The transistor did not immediately receive such a familiar name. Initially, by analogy with lamp technology, it was called a semiconductor triode. The modern name consists of two words. The first word is “transfer” (here, I immediately recall “transformer”) means a transmitter, converter, and carrier. And the second half of the word resembles the word "resistor" - a detail of electrical circuits, the main property of which is electrical resistance.

It is this resistance that occurs in Ohm's law and many other formulas of electrical engineering. Therefore, the word "transistor" can be interpreted as a resistance converter. About the same as in hydraulics, the change in fluid flow is controlled by a valve. For a transistor, such a “valve” changes the amount of electric charges that create an electric current. This change is nothing but a change in the internal resistance of a semiconductor device ...

This article is more of a fact-finding and recommendatory nature and, possibly, stopping someone from taking ill-considered actions, from wanting to independently connect a generator.

So, how to connect the generator? If you drive the phrase “How to connect the power station to your home” in Google, then you will get a link to the YouTube video, where the bearded uncle shows clearly what to do, in what order to connect, where to stick. Whether or not to follow his instructions for connecting the generator is a purely personal matter, but we would not recommend doing this, since this method is extremely dangerous for both the generator and others.

I will tell you one case from my own practice. In a nutshell about yourself, who I am and how I make money from bread))). I am engaged in the sale, installation and maintenance of generators. When selling mini-power plants, we usually offer customers ...

TN - C - S system. The diagram shows the minimum necessary kit to protect your home. The ILV relay will protect your home from overvoltage and undervoltage at the input. And if you can not protect yourself from the increased voltage (breaking the PEN wire is unlikely), but what the hell is not joking, and the lower voltage can always occur, which is extremely dangerous for electric motors. In addition, if you have an UZO electronic, then with a reduced voltage or a broken only neutral wire, it may simply not work and leave the house without protection.

The RCD will protect you from direct contact with the phase conductor, from leakage currents that can cause a fire, and also instantly turn off the faulty power plant (when the phase closes to its case). The circuit breaker will monitor short-circuit currents and overload in the network. Regarding the re-grounding of the PEN wire. According to the PUE, clause 1.7.61 "... Re-grounding of electrical installations with voltage up to 1 kV ...

Dear Reader! It is necessary to recognize the fact that in the private residential sector and especially in cottages there is an extremely unfavorable situation in terms of electrical and fire safety. Violations are of a large-scale nature.

Especially depressing is the fact that both professional electricians and electrical engineers themselves sometimes do not understand and do not know certain provisions of the EMP and other regulatory documents. The purpose of this article is to help both electricians and homeowners correctly perform certain tasks.

Consider all the dangers that may lie in wait for people and the house from electricity. 1. Direct contact with the human phase. 2. Short circuit (short circuit) between phase and zero. 3.Damage to the insulation of the phase conductor with its subsequent closure on the metal casing of the electrical installation ...

The simplest and most widely used method that ensures the operation of a three-phase electric motor from a household network is to connect one of its windings through a phase-shifting capacitor. The article discusses in detail the issues of calculating engine power and capacitance of a capacitor for various switching schemes.

To calculate the motor power and capacitance of the capacitor, you need the following data: N - power in kilowatts, I - current in amperes, efficiency. This data is on the tag of each engine.

Usually, two currents are given on the tag - for the star and for the triangle. You need to take a current for the star. We will extract other data from them: Na = 1000 * N / (3 * Efficiency), W is the active power of the winding, Z = U / I, ohm is the impedance of the winding, U = 220 V is the voltage across the windings, R = Na / I2 , ohm is the active resistance of the winding. This resistance cannot be measured by a tester and you will not see it when disassembling the engine. In explicit form, it is not. It appears only when working ...

The first part of the article told about the history of the emergence and development of remote controls (remote control) for controlling household television equipment.

Despite all the technological breakthroughs, increasing the speed and number of teams, improving the design and noise immunity of the remote control, this is perhaps the most vulnerable node of the body and video equipment. It is he who gradually or immediately ceases to work, leading the hosts to bewilderment. Next, various typical malfunctions of remote controls and methods for their elimination will be considered.

The TV does not respond to any of the buttons on the remote control. The question immediately arises - what to do and who is to blame. Undoubtedly, it is necessary to start the verification with what is simpler, namely with the remote control. First of all, you need to check if the remote control works at all. It is very easy to do. It is enough to bring the remote control LED to the camera lens ...

Remember how in the cartoon “three from Prostokvashino”, Uncle Fedor’s mother said: “I’m so tired at work that I can’t even watch TV!” Apparently, this phrase is the answer to the question why all modern household equipment has infrared remote controls (RC). But, if you look, it all started much earlier.

The first work on remote control was carried out by the Germans in the late 30s of the twentieth century, even before the outbreak of World War II. The object of automation was a tube receiver. The control panel was a separate metal panel with buttons. Pressing the button triggered the actuator, - relay, electromagnet or motor. The connection between such a remote control and the receiver was made by a multicore cable, which still tied the listener to a specific place. Similar remotes were in the Soviet first-class tube TVs ...

The article discusses various ways of laying hidden wiring in an apartment.

Apartment renovation can only begin after all issues regarding the installation of new wiring have been resolved. To do this, put on the plan of the apartment the proposed arrangement of furniture. If you intend to purchase new furniture, you must accurately find out its dimensions. After arranging the furniture on the apartment plan, the installation locations of sockets and switches are determined. It is always necessary to provide several backup outlets. Even if they are covered with furniture.

The most difficult thing is to determine the wall lamps (sconces) near the bedside tables, as they are rigidly attached to the bed.In the place where the cable exits the wall for connecting the sconce, it is convenient to put a small installation box into the wall, into which you can hide the cable during wallpaper gluing. But you need to be sure that the box is completely closed ...