input devices

The computer functions

A computer is basically a device whose primary function is to process large amounts of data with great speed and accuracy, task is accomplished by hardware components, ie the physical part, and software, which are programs. A PC can perform many complex tasks, and for that uses a set of instructions, the aforementioned software, that basically are orders that the computer must process through the hardware, producing an output data an understandable format for its users.

As mentioned, a computer is composed of two subsystems, hardware and software, where the first of which comprises the computer itself and all peripherals input and output, including keyboard, mouse, monitor, printer and other, while the software subsystem includes the operating system, which is responsible for translating what we do to PC language, and all user programs, i.e. office suites, design software, modeling, mathematical software, and many others.

Computer functions

What does “process information”?

The action of “process” is related to the act to modify or transform something from its original state to a new one. The computer can process information from different types: text, numbers, images, sounds, and many others sources. The information you work the computer must be entered by the user.

The computer ability for data process can be summarized through the following basics:

Store information:

The computer has the ability to store, in a small space, large amount of information that otherwise would have to print in thousands of paper sheets.

Computer functions

Organize information:

This feature gives the user the option to sort or organize the information according to their own needs and requirements. By this way, we can find and examine documents and data the number of times we want.

Retrieve Information:

His great ability to store information would be useless if we cannot quickly and easily retrieve and examine it. In this regard, the computer offers us the possibility to check instantly and accurately any information you have previously saved on it.

Computer functions

Transmitting information:

One of the most important features of the computer is the ability to share information between users quickly, securely and accurately. This fantastic feature depends on whether our computer is connected to the Internet or local network.

Input Devices

The input peripherals or devices are system components that responsible for providing data to the computer, and without them it would be impossible to attempt any operation with the PC. Over the years, technology has evolved incredibly, but the way we have to communicate with a computer remains the same since four decades ago.

Although today we can find many attempts to replace these devices, the fact is that the ease that these old comrades of the PC supply us for the entry and manipulation of data are practically inimitable, and we have become so accustomed to their use it will be impossible to get rid of them easily.

Input Devices

From this point, this article will discuss all the characteristics of three peripheral input devices that are the most popular and used worldwide.

The three most common examples of input devices are:

  • The keyboard
  • The mouse
  • The scanner

Each of these devices has a number of conditions that allow us to enter data to the computer in different ways.


The keyboard is basically a set of buttons, which they represent, each, different characters. In conjunction with the display, form the basic kit of input and output data.

The computer keyboard is similar to the old typewriters machines keyboard, except that some keys are added to control certain functions of the PC, such as Ctrl, Windows key and Pause, among others.

Input Devices

They also have other characteristics as shortcut keys, which are special keys that can help users save steps to get to a particular place or run various applications as email, web browser or file browser.

Examples of shortcut keys are the keys F1 to F12 and so-called multimedia keys, which allow us to trigger commands of music player or video such as up or down the volume and play or pause.

It is considered the main input device until the voice recognition systems are perfected to the point that they have succeed in interpreting speech.

Note that keyboards can have the Dvorak or QWERTY key layout, the latter being the most widespread.


Mouse are small and ergonomic device with two or three keys or buttons and a very useful Internet browsing central wheel. As moves on a flat surface, the movement produces a similar movement in the cursor displayed on the screen.

Input Devices

There are many types and models of mouse, and among them are wireless, optical and laser, which use different types of technologies to achieve the movement.


This peripheral it is capable of digitizing drawings and photographs, allowing these to be stored in the computer in digital format for later use.

Input Devices

Voice recognition system

This new technology is able to digitizing the voice through a device such as microphone, allowing the computer to recognize and execute commands through human speech. While it is a subject that is constantly developing, they have taken sufficient steps and today has a level of sophistication such that it can be used in some types of applications such as implemented in the iPhone, called Siri, in Windows through Cortana, or in the Android operating system through Google Now.

Input Devices

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Input devices: The mouse

The mouse is a device designed to be operated by hand by the user. It works by moving or dragging it on ​​a flat surface. These movements are transmitted to the computer through a cable or wirelessly, using various technologies such as laser and optical sensors.

The mouse operation is as simple as moving from one place to another in an area to the point you want to select. If the user drags the mouse to the right, this movement will be reproduced and represented on the monitor screen by a symbol (icon) that mimics the movement. In practical terms, the mouse is like an extension of your hand, which is “introduced” on the monitor screen of our computer.

Input Device The Mouse

The mouse movements are represented on the screen by an icon known as “pointer”. Generally the pointer is shaped like an arrow, but sometimes can assume other according to the program you are using or the function that is fulfilled. The pointer would be like the hand, which can select objects, take them, drag them, and execute programs and documents, among others.

In computing over time they have invented words to name and describe the actions that can be performed with the mouse. Following are the most important.

Input Device The Mouse

Slide or drag

This name was assigned to describe the action of moving the mouse in any direction on the surface of the pad.

Click or clicking

This denomination refers to the action of pressing and releasing with the index or middle finger, as appropriate, one of the mouse buttons (right or left). This word is used because somehow mimics the sound that occurs when pressing the buttons on the mouse.

Input Device The Mouse

Make Double Click

This curious name was assigned to refer to action of pressing and releasing, in quick succession, twice the left mouse button. This action is generally related to the function of activating a software application or open a file, folder or menu.

Computer components

In simple words, a computer is a PC is a computer system composed of several electronic components that work together to provide output data processed. They shape what is known as hardware, and are responsible for processing all instructions provided by the software which is loaded or run on the computer.

In this article we will know a little more about the hardware and the functions performed by each of these components within the PC.

Computer components

Cabinet or case

The cabinet or case it is where they accommodate all the electronics components. Normally, it is a rectangular box. Inside this box are many electronic components that process information. The most important of these components is the CPU (central processing unit), or microprocessor, which acts as the “brain” of the computer.

Another important component is the RAM (random access memory), which temporarily stores information used by the CPU while the computer is being used. Information stored in RAM is erased when the computer is turned off.

Computer components

Virtually all the other components of a computer are connected through cables to the cabinet, to the power supply or at the motherboard. The cables are connected to the inputs (ports) specific, normally found in the front of the cabinet. The hardware that is not part of the system unit, i.e. that is not found within the cabinet is sometimes called external or peripheral device.


The computer has one or more storage drives (devices that store information on a metal, electronic memory or plastic disk). In them the information and documents are stored while the computer is off.

Hard drive

The computer stores the information and documents that we made in various media, including mechanical and magnetic and SSD hard drives. Because hard disks can hold large amounts of information, they usually serve as support for primary storage of the computer, storing almost all programs and files. The hard disk drive is normally located inside the system unit.

Computer components

CD, DVD and Blu-Ray

Virtually all modern computers are equipped with a CD or DVD, usually located on the front of the system drive. The optical drives use lasers to read and write data to a CD, DVD or Blu-Ray. If you have a recordable disc drive, you can save copies of your files in the blank optical media. You can also use the CD drive to play music CDs on your computer.

DVD readers, besides this type of format, can read CDs, if you have a DVD drive, you can watch movies on your computer. Currently all DVD drives can write data on blank DVDs.

Computer components

If you have a CD or DVD drive, periodically make a back up of your important files and documents in CDs or DVDs. Thus, if the hard drive fails or breaks, you will not lose data.

As for Blu-Ray drives, even if have spread, the truth is that not in the way expected. In this may have to do the mass media cheaper and easier to use as pendrives and memory cards storage. However, for these devices it is still elusive storage capacity of a Blu-Ray, approximately 50 Gb.

Mouse (pointer device)

The mouse is a small device used to point and select items. Although the mouses have various shapes, the typical device does look that resembles a mouse, hence its name. It’s small, rounded and connected to the PC through a cable. Note that some newer mouses are wireless.

Generally, a mouse has two buttons: a primary button (usually the left button) and a secondary button in the right side. Many mouses also have a wheel between the two buttons, allowing an easy displacement between the different elements of the screen.

Computer components

When you move the mouse with the hand, the pointer moves on the screen in the same direction. (The appearance of the pointer can change depending on the position and the item you is marking in the monitor). When you want to select an item, you just have to point to the item and “click” (action of press and release) the primary button. Point and click with the mouse is the main way to interact with the computer.


The keyboard of an computer is used mainly for typing text into on word processor, like a Microsoft Word. Just as that the keyboard of a typewriter, the computer keyboard has keys with letters and numbers, but it also has special keys:

  • The function keys, located on the top line, perform different functions depending on the mode being used.
  • The numeric keypad, located on the right side of most keyboards, allows you to enter numbers quickly. Note that some keyboard not have numeric pad.
  • The navigation keys, such as the arrow keys, allow you to change the position in a document or web page.
  • A small little known trick used by many users is that we can use the keyboard to perform many of the functions that we perform using mouse.


The monitor of a computer displays information in visual form, through text and graphics. The portion of the monitor that displays the information is called the screen. As a television screen, a computer screen can show still or moving images.

There are three basic types of monitors: CRT (Cathode Ray Tube, almost obsolete), LCD (Liquid Crystal Display) and LED, this type much more modern. All the types produce sharp images, but the LCD and LED monitors have the advantage of being much thinner and lighter.

Computer components


A printer are able to transfer data, i.e. documents and photos, from computer to paper. You do not need a printer to use the computer, but if you have one of them, you can print emails, cards, invitations, announcements and any other material. Many people also take advantage of the possibility to print photos at home.

There are two main types of printing devices: inkjet printers and laser printers. The inkjet printers are the most commonly used printers. These printers can print in black and white or color and can print high-quality photos, using special photo paper. Laser printers are faster and better support a more intensive use.

Computer components

Speakers and headphones

Speakers and headphones are used to reproduce the sounds created by computer, whether music or sound system. The speakers can be integrated into the system unit or connected to this through cables.


Currently, one of the most important elements of the computer, since so we could connect to the Internet we need this device one way or the other. A modem is a device that sends and receives information through a telephone line or high-speed cable.

Computer components

Modems are sometimes were installed into the cabinet, on the motherboard, but not are the fastest. Currently, these devices are no longer used, being replaced by external ADSL or cable modems, which also incorporate router features.