One day, leafing through statistics, I came across a table listing the distribution of professions by area of ​​employment, that is, by place of work (manufacturing, transportation, medicine, science, business, etc.)

What was the surprise when almost in every column of a separate industry, and even in several directions, there was a particular electrical engineering specialty.

Roughly estimating received about 85% of industries can not exist without a serious electrical contingent.

Serious!

This is not two or three electricians on duty, but their own electric workshop, workshops, laboratories. These are enterprises operating electrical equipment of medium complexity and medium capacity.

Why is this all?

And the fact that the great need for electrical personnel continues to grow. It is necessary to fill in creative interesting empty places!

And who should fill out, if not those who know all the advantages and even the magnificence of these professions.

It is difficult to understand a situation where many people have all the makings and opportunities to devote themselves to this area of ​​activity, but they do not use it ...

In wildlife, there are many processes associated with electrical phenomena. Let's consider some of them.

Many flowers and leaves have the ability to close and open depending on the time and day. This is due to electrical signals representing an action potential. You can make the leaves close with external electrical stimuli. In addition, damage to currents occurs in many plants. Slices of leaves, stems are always negatively charged in relation to normal tissue.

If you take a lemon or an apple and cut it, and then attach two electrodes to the peel, they will not reveal the potential difference. If one electrode is applied to the peel, and the other to the inside of the pulp, then a potential difference will appear, and the galvanometer will notice the appearance of amperage.

The change in the potential of some plant tissues at the time of their destruction was investigated by the Indian scientist Bos. In particular, he connected the external and internal parts of the pea with a galvanometer. He heated a pea to a temperature of up to 60 ° C, while an electric potential of 0.5 V was recorded. The same scientist investigated the mimosa pad, which he irritated with short current pulses ...

Explain to me, is it possible to reduce energy consumption by one hour, save electricity? In any significant amounts.

As I understand it, from the fact that half a city will plunge into darkness for an hour, nuclear power plants will not burn less fuel. Well, ok, 70% of the electricity in the US is generated by thermal power plants. Are thermal power plants able to “respond” to load reduction? I am not so sure. Even if they know how to do it, what is the latency of this operation? And, the strangest thing is how quickly they can “win back” the slide.

There is another very funny moment. If citizens turn out to be quite conscious and “cut off” electricity at exactly 20:00 or even in a small interval around 20:00, then the sharply increased load on the network, which is fed by power plants with “muffled” boilers, can cause funny consequences.

If residents, for example, of the same Dubai turned off the lights every day at exactly 19:00, and turned them back on at 20:00, then the power plants (theoretically) could adapt to consumers ...

August 18th.Today, I finally ran the cable through the wall adjacent to the neighbor from the corridor distribution box to the outlet in the hall. To do this, removed the old wires from the channel. To one of them fastened a cable. In general, for this I advise you to purchase a cable in PVC insulation. I took a chance without. I hooked one cable core to the cable, squeezed out the rest so that they would cling and use the pull-push method, pulled the cable in the room by rushing from the corridor to the hall.

Now I just have to drill a plug from this socket to the left at the end wall (I did not have a corner apartment and sockets on this wall). After that I will put the socket outlets, and tomorrow I will proceed with the installation of the socket group in the distribution boxes.

August 27th. All! I - an unprofessional electrician, finally managed to change the wiring! No more tripping over extension wires! Further without emotions. Today I connected the wires in the junction boxes ...

It is always interesting to observe changing phenomena, especially if you yourself are involved in the creation of these phenomena. Now we will assemble the simplest (but really working) electric motor, consisting of a power source, a magnet and a small coil of wire, which we ourselves will do.

There is a secret that will make this set of items become an electric motor; a secret that is both smart and amazingly simple. Here is what we need:

• 1.5V battery or battery.

• Holder with contacts for the battery.

• Magnet.

• 1 meter of wire with enamel insulation (diameter 0.8-1 mm).

• 0.3 meters of bare wire (diameter 0.8-1 mm).

We will start by winding the coil, the part of the electric motor that will rotate. We will start by winding the coil, that part of the electric motor that will rotate. To make the coil sufficiently smooth and round, wrap it on a suitable cylindrical frame, for example, on a AA size battery ....

In 1996, engineer Roy Kuennen struggled to solve one problem: how to make Amway Corp a household water purifier. didn't break? The filter killed the bacteria with an ultraviolet lamp, but for this it had to be immersed in water. The wires that supplied the lamp with electricity rusted. Then engineer Kuennen had a crazy idea: remove the wires and feed the lamp remotely - using a magnetic coil.
While Kyuennen was tormented with a water filter, the wireless revolution was already in full swing - starting in the 90s, she gave us a cell phone, Bluetooth and Wi-Fi, but only in recent years began to cover the area of ​​power supply. Several companies are now looking for ways to supply electricity to mobile phones, PDAs, laptops and other gadgets directly, without the need to connect them to the network.

The first such products have already entered the market - for example, the charging "mat" for the Motorola Razr phone, developed by WildCharge. It does not consume much energy, as it comes in direct contact with the phone itself. However, the initial idea of ​​Kyuennen - to charge devices remotely - this does not correspond. 12 years after his experience with a filter for water purification, he is ready to introduce a truly contactless charging technology into everyday life.
Kuennen used the old idea of ​​energy transfer through a magnetic field, voiced by Faraday and Tesla. The current passing through the wire spiral creates an electromagnetic field; under the influence of this field in another spiral located nearby, a current also appears. Fulton Innovation, co-founded by Kyuennen, may launch a device this year that charges various gadgets with a magnetic coil hidden under a desk or other surface ...

At the end of the 19th century, the discovery that electricity could be used to make a light bulb glow caused an explosion in research aimed at finding the best way to transmit electricity.

At the head of the race was the famous physicist and inventor Nikola Tesla, who developed a grandiose project. Unable to believe in the reality of creating a colossal network of wires covering all cities, streets, buildings and rooms, Tesla came to the conclusion that the only feasible transmission method is wireless. He designed a tower approximately 57 meters high, which was supposed to transmit energy over a distance of many kilometers, and even began to build it on Long Island. A series of experiments was carried out, but the lack of money did not allow the completion of the tower. The idea of ​​transmitting energy by air was scattered as soon as it turned out that industry was able to develop and implement a wired infrastructure.
And now, a few years ago, associate professor of the Department of Physics at the Massachusetts Institute of Technology (MIT), Marin Soljačić, was awakened from a sweet sleep by the insistent cries of a mobile phone. “The phone didn’t stop, demanding that I set it to charge,” says Soljacic. Tired and not about to get up, he began to dream that the phone, being at home, begin to charge on its own ...