An uninterruptable power supply (UPS also said, from English Uninterruptible Power Supply) is a device used to maintain constantly electrically powered in alternating current electrical appliances. It becomes necessary where the electrical equipment may in no case remain without power (eg in public places such as hospitals, power plants etc. ..) a disservice by not creating more or less severe. It is very useful especially in countries where they produce regular and frequent blackouts.

Building technology

Basically it is a device consisting of at least three main parts: a first converter AC / DC (AC converter) which, thanks to a rectifier and a filter, converts the alternating voltage of the electrical network in DC voltage, a battery or more accumulator batteries in which is stored the energy provided by the first inverter and a second inverter DC / AC (AC converter) that draws power from the rectifier or from the battery in case of lack of power supply, provides power to the connected load.

Among the objects of technology more prevalent in homes and businesses is the wifi router, that device that allows you to create a wireless network so you can connect to the internet each computer or mobile phone without the need for wires.

Anyone who wanted to remove the cables from home, he can buy a wifi router and connect it to your modem provided by the ISP.

Even those who already have a router can buy a new one to replace the old or less quick to extending the range of the signal (even if this is done before with an access point cheaper).

Who does not know what a router, or at least if you do not know what to look at, it can read this guide to buying, to know what kind of router model and get the best buy at the lowest price possible.

The current progress of the consumer market of laptops is pushing consumers to the tablet or tablets with touch screen of the iPad is now the most famous interpreter.

The increase in tablet brings a contraction in the netbook market ie laptops small, compact size.

Netbooks are different from regular laptops because they are smaller and therefore more portable and lightweight, with screen size ranging from 9 to 11 inches.

Just to meet this growing audience, Microsoft is developing a Windows 8 optimized for tablets and also Google continues to push its Android that now is not just an operating system for smartphones but can also be used on typical computers.

The Smart TV is the kind of TV you define smart because the viewer can interact with the same and receive personalized information.

The smart TV can be controlled by voice or with gestures, has an internal operating system that can be installed application and can do many other things.

Let's see what are the Smart TV on sale in malls and appliance stores. 

Steve Jobs once theorized that the tablet would, at some point, achieved normal desktop computers and supplanted the notebook market.

At that moment it seemed the declaration of a madman, why give up on a real PC to use a small portable device with which it is impossible to work?

In his speech, Jobs had made a comparison between trucks and cars saying that before, when the country was predominantly agricultural, trucks were used more than cars, why and what is needed, then urbanization has changed everything, and the car has become more popular.

In shopping malls and appliance stores, between the various models of televisions are the 3DTV, which are now also at low prices and less than 500 Euro.

Anyone who is considering buying one, can read in detail what it means 3DTV and what different types exist.

To make a three-dimensional video is resumed with a special technique of double recovery, which simulates double vision right eye and left eye.

The technique of 3D cinema, based on a double recovery, projecting two images on the screen or simultaneously or alternately.

The tablet will not be as useful for work, but they certainly are convenient, enjoyable and also very useful to browse the internet and use applications from the couch, bed, and around.

For a tablet, be it of a Nexus 7, Kindle Fire or Samsung Galaxy with Android is that it is an iPad, the Internet is important because many apps they need to function.

My advice in this opinion article, is to always save a lot of money by buying the Wifi-only version, without 3G data connectivity.

The LED TVs are special types of LCD TV, but which differ from the latter for the type of backlight. In fact LEDs are used instead of the lamps to illuminate the panel as occurs for traditional LCD. This type of cutting-edge technology results in a marked improvement of the images, with a greater range of colors, which are also the most crystalline, you also have lower power consumption and thinner TV. However, the cost of the LCD screens to LED is higher.

WHAT IS THE DIFFERENCE BETWEEN

The LCD (Liquid Crystal Display) or liquid crystal displays, are very common nowadays on televisions, computer monitors, some watches, mobile phones and microwave ovens. The main advantage of LCD technology is in the pictures, which are the result of the orientation of the liquid crystals which are composed of individual cells that make up the screen; also other key feature is the source of exterior lighting. The LCD screen is based on a system of three primary colors that constitute each pixel, however, the liquid crystals do not emit any light of its own, and it is for this reason that requires a source of backlight for this purpose are used CCFLs, ie the lamps cold cathode fluorescent.

The monitor has a screen, specially used to display images, as a fundamental component of a computer, but can also be used as a television set, whereas the color TV is a real television set, which receive the signal via tuner (which can be analog, digital, satellite, etc. ..), and can only be used as such.

WHAT IS THE DIFFERENCE BETWEEN

The term usually indicates that device electronic monitor that allows the display of video images. The monitor is usually connected to a computer and acts as the output device, since it translates into images electrical signals, optical or electromagnetic, and may possibly be equipped with speakers for audio playback. The monitors run the signal through an RGB: stands for red, green and blue, the primary colors in the color mode that takes the name of "additive", since the combination of these colors is in another color whose Brightness is the sum of the brightness sources.

The printer is one of those things that never fails at home and in the office.

For this reason it is important to understand how they work and the alternatives available on the market so you can choose the best printer for your needs and for their own pockets.

The printers are not all the same, there are printers of all types, so when you go to buy a printer, you might stop a moment to think over the offer of the day and buy a unit more durable, more feature-rich, more statement at the time and of higher quality.