Linggo, Nobyembre 1, 2015

TABLET COMPUTERS

For the computer input device, see Graphics tablet. For other uses, see Tablet.
"Tablet PC" redirects here. For the class of Microsoft Windows-based tablets, see Microsoft Tablet PC.
"Convertible (computer)" redirects here. For the IBM computer of this name, see IBM PC Convertible.
Apple iPad, a tablet computer
tablet computer, commonly shortened to tablet, is a mobile computer with atouchscreen displaycircuitry, and battery in a single device. Tablets come equipped with sensors, including cameras, a microphone, and an accelerometer, and the touchscreen display uses the recognition of finger or stylus gesturesreplacing the usage of the mouse and keyboard. They usually feature on-screen, pop-up virtual keyboards for typing. Tablets may include physical buttons for basic features such as speaker volume and power, and ports for network communications and battery charging. Tablets are typically larger than smartphones or personal digital assistants at 7 inches (18 cm) or larger, measured diagonally.[1][2][3][4] Tablets can be classified into several categories according to the presence and physical appearance of keyboards. Slates and booklets do not have a physical keyboard and typically feature text input performed through the use of a virtual keyboard projected on a touchscreen-enabled display. Hybridsconvertibles and 2-in-1'sdo have physical keyboards (although concealable or detachable), yet these devices typically also make virtual keyboards available.
Conceptualized in the mid-20th century[5] and prototyped and developed in the last two decades of that century, the first modern tablet, the iPad, was released in April 2010.[6] In March 2012, PC Magazine reported that 31% of U.S. Internet users owned a tablet, used mainly for viewing published content such as video and news.[7] The top-selling line of devices was Apple's iPad with 100 million sold between its release in April 2010 and mid-October 2012,[8] but iPad market share(number of units) was down to 36% in 2013 with Android tablets selling to 62%. Android tablet sales volume was 121 million devices, plus 52 million, between 2012 and 2013 respectively.[9] Individual brands of Android operating system devices or compatibles follow iPad with Amazon's Kindle Fire with 7 million, and Barnes & Noble's Nook with 5 million.[10][11][12] As of February 2014, 83% of mobile app developers were targeting tablets,[13] but 93% of developers were targeting smartphones. As of 2015, tablets are a large product category ever since the iPad was released in 2010, when tablets experienced a rapid rise in popularity and ubiquity.[14]
As of July 2015, the tablet use in the world is nearly split evenly between the iPad and Android tablets with about half the world using the latter,[15] with the iPad holding majority use in North America, Western Europe, Japan and Australia and Android tablets are more popular in most of Asia (China an exception), Africa and Eastern Europe.

Sabado, Oktubre 17, 2015

functions of a computer

                 functions of a computer

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SCIENCE

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krishna-agrawala's profile pic
Posted on  (Answer #2)
The computer are used today for an almost unlimited range of applications. However, irrespective of the application for which a computer is used we can identify a few basic functions that are performed by all computers> All the computer applications are make use of these basic function of computers in different ways and combinations. There are basically for basic functions of computers - input, storage, processing and output. These are described below:
  1. Input: Receiving or accepting information from outside sources. The most common way of performing this function is through the information entered through the keyboard and the click of mouse. Of course there are many other type of devices for receiving such information - for example, the web cam. Computers are also able to receive information stored in other devices like DVD disks and pen drives. Computers are also able to receive information from other computers and similar devices. When we use computers for automatic control of machines and processes, computers are also receive information directly from such equipments and processes.
  2. Storage: Store information in the computer. The memory is stored in computer in in several different ways depending on how the information is used. For simplicity we will classify in two broad categories. First is the memory in the central processing unit of the computer, and second is the auxiliary memory. The auxiliary memory includes devices such as fixed hard drives. The information stored in computer can also be divided broadly used in two categories. The user data and the instructions used for internal operation and processing in the compute. These instruction are what we call computer programs or software.
  3. Processing: This is really the core of computer operation. The computer processes the data that is fed to the computer by various means and the data already contained in internal memory to produce the results that is the core of all computer application.
  4. Output: The results of the processing are made available for use by any user or other devices. The most common ways of producing such outputs are through computer monitor, speakers, and printers. When a computer is connected to other devices, including through Internet, this output is in the form of electrical pulses. The output data can also be recorded on to an external recording medium such as a DVD disk.


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