Lighting accounts for a large share of energy consumption worldwide, for example, it is estimated that about 12 percent of total electricity consumption is accounted for by lighting. The reason is that the traditional incandescent bulbs that are very common today (Ilyich’s bulb here, or Edison’s bulb in the USA) consume a lot of energy, 90 percent of the energy is simply lost in them in the form of heat.

The main alternative to this day were only compact fluorescent lamps and LEDs, which, consuming significantly less electricity, can produce as much light as incandescent lamps. However, the fourth lighting option is approaching, and the technology called FIPEL is rightfully considered the first in the last 30 years, claiming the title of a new technology of energy-saving lighting. FIPEL from Field-induced polymer electroluminescent (field-induced polymer electroluminescence) ...

Any light source is a source of light flux, and the larger the light flux falls on the surface of the illuminated object, the better this object is visible. And the physical quantity, numerically equal to the luminous flux incident on a unit area of ​​the illuminated surface, is called illumination.

Illumination is denoted by the symbol E, and its value is found by the formula E = Ф / S, where Ф is the light flux, and S is the area of ​​the illuminated surface. In the SI system, illumination is measured in Luxes (Lx), and one Lux is such illumination at which the luminous flux incident on one square meter of the illuminated body is equal to one Lumen. That is, 1 Lux = 1 Lumen / 1 Sq.m. As an example, here are some typical illumination values: a sunny day in the middle latitudes - 100,000 Lx, a cloudy day in the middle latitudes - 1000 Lx, a bright room illuminated by the sun ...

Any electrician periodically encounters the need to lay electrical wiring inside concrete or brick walls, which have to be drilled or ditched. Performing such tasks is more convenient with a specially designed rotary hammer.

In order to successfully select his model for work, we suggest that you familiarize yourself with the features of various designs and a list of technical solutions for their implementation, embodied in the diverse designs of rotary hammers produced by modern manufacturers.

The puncher is created for making holes in concrete, brick, stone building structures of increased strength by the method of applying mechanical impacts to a nozzle that performs a combined translational-rotational movement. Additional tasks of the punch are: drilling holes in various materials due to the function of a drill, applying a long series of axial impacts ...

In this article, I will tell and even show clearly, in pictures, how to transfer the generator to gas. Can I make a gas reducer myself? In many forums, on the Internet, on youtube you will find a bunch of recommendations on how to convert a gas generator to gas. Someone recommends using home-made gearboxes, which I categorically do not recommend doing, there are also ready-made gas kits that allow you to remake the “native” carburetor just for working on gas, while others drill something in the carburetor ...

All this, let’s say, is not the best and safest way to convert a gas generator to gas. Why reinvent the wheel and seek adventure at its fifth point, when everything has already been invented and tested on hundreds of generators. I recommend to purchase such a gas module. How much is a gas kit? The issue price is only $ 50-60. Agree, the money is relatively small. For the money you get a new carburetor ...

Everyone who watched the Back to the Future trilogy probably remembers how Marty McFly escaped the chase on a hoverboard soaring. To this day, the idea of ​​recreating a hoverboard excites the minds of many inventors - enthusiasts. Even Lexus did not neglect this idea. However, not only Lexus achieved their goal on the way of translating this fantastic vehicle into reality, but first things first.

At the end of 2014, after successfully collecting $ 500,000 on kickstarter, Greg and Jill Hendersons realized their plan. By creating Arx Pax, the couple finally built the world's first hoverboard, which they named Hendo Hover. The skateboard hover technology is based on the repulsion of magnetic fields, which creates a counteraction to the force of gravity. The magnetic cushion trains soar in about the same way, the only difference is ...

The safety of using electric energy depends not only on the correct installation of the electrical installation, but also on compliance with the requirements laid down in the regulatory documentation for its operation. The grounding circuit of a building, as part of protective electrical equipment, requires periodic monitoring of its technical condition. In the normal power supply mode, the ground loop of the PE conductor is connected to the housings of all electrical appliances, the potential equalization system of the building and is inactive: through it, roughly speaking, no currents pass, except for small background ones.

In the event of an emergency related to the breakdown of the insulation layer of the wiring, hazardous voltage appears on the body of the faulty appliance and flows through the PE conductor through the ground loop to the ground potential. Due to this, the value of the high voltage transmitted to the non-conductive parts should decrease ...

In 2004, Russian scientists Konstantin Novoselov and Andrei Geim working at the University of Manchester (Manchester, UK) were able to obtain graphene on a silicon oxide substrate. It was a stable two-dimensional film due to its bonding with a thin layer of oxide (dielectric). The parameters of carbon films one atom thick (a million times thinner than a sheet of paper), such as electrical conductivity, the Shubnikov-de Haas effect, and the Hall effect were then measured by scientists. Novoselov and Game received the Nobel Prize for these advanced works in 2010.

Today graphene can rightfully be called revolutionary material of the 21st century. This carbon compound is the thinnest, strongest and has the highest electrical conductivity. Today, several billion dollars has been allocated for the study of graphene, and according to scientists, this material can replace silicon ...

Gate means a mechanical structure mounted in a wall to restrict and regulate access to a controlled area. According to the device, they can be conditionally divided into: a mechanical enclosure attached to the building elements of a building or fence as part of a stationary and movable structure, a drive that performs the operation of opening or closing the gate leaves with a fixation of the executed position, automation that controls the operation of the main parts of the drive system.

According to their technical performance, modern designs used for installation in a cottage, cottage, garage are mounted according to one of the following principles: hinged, usually made by two leaves, sliding, made by a single solid door moving along the lower metal tee or other supporting profile and supported by top rail ...

Portable generators can be used almost anywhere you need electricity. Tourists use them to light tv catering tents, enjoying the fresh air. Builders use generators to power power tools at construction sites not yet connected to the city’s power grid. In private homes and enterprises, generators are used as part of the power system, which allows you to continue to use various electrical appliances for the duration of a power outage in the main network.

But, regardless of their purpose, generator engines require fuel. Most portable generators run on gas or gas. Both types of fuel have their advantages and disadvantages, and we’ll talk about this. Gasoline generators are the most common type of generator, because gasoline, unlike gas ...

Why buy an inverter generator when conventional generators are cheaper? The answer is quite simple. The main advantage of inverter generators is that they work much quieter compared to conventional generators. Sound or noise produced by a generator is measured in decibels. Some of the quietest models of inverter generators "issue" about 50-55 decibels. Conventional generators of similar power will produce 65-70 dB.

A 10 dB increase in noise is perceived by us as a 5-7-fold increase in sound. Therefore, the generator "issuing" 70 decibels will be 10 times louder compared to another generator "performance" 60 decibels. Modern inverter generators of the latest generation are barely audible from a distance of 6-7 meters. This is a real benefit for those living in areas where noise is a problem. or when traveling to nature, to a park, where the permissible noise level should be in the range of 40-50 dB…

Since 2011, Harald Haas, a specialist in optical wireless data transmission, a professor at the University of Edinburgh (Edinburgh, UK), has been seriously promoting a fundamentally new technology for wireless data transmission through flashing LED lights. Then most university professors decided that the idea, of course, was interesting, but hardly realizable. And now, four years later, Haas nevertheless created the first router that works according to his concept.

The technology is called Li-Fi (light - light, fidelity - accuracy). The new router showed such amazing characteristics that it was 100 times faster than Wi-Fi, reaching in laboratory conditions a record data transfer rate of 224 Gb / s. Laboratory tests were conducted by the Estonian company Velmenni. Haas even supplied his first router with a solar battery to make access to the network autonomous ...

In 2014, the startup company Roost introduced the Roost Smart Battery with a built-in Wi-Fi module, designed to permanently solve the problem of smoke detectors triggering when the battery is low, which has become a real nightmare for some homeowners.

The module with a 9-volt battery of the Krona type, costing $ 35, is simply inserted into a standard smoke or carbon monoxide detector, and in case of an emergency notifies the owner about it, sending him a message on the smartphone. Although the device performs only one of this function, it copes with it with a bang.

The Roost Smart Battery doesn’t look pretentious, and you don’t need to, because when you install it in a smoke detector, you don’t have to look at it regularly. It looks like an ordinary Krona with standard terminals, its white case with blue ends is decorated ...