Input and Output Devices
We give unprocessed data to computer with the help of input devices and get output after the data has been processed. We can understand that output. The input devices may be hand operated or automated.
The act of processing is mainly regulated by CPU.
Hand Operated Input Devices
Keyboard and Mouse are the most commonly used hand operated input devices. some of the hand operated input devices along with keyboard and mouse are as follow:
Concept Keyboard
Concept keyboard is related to a special function or item. The labels of picture or text may reside above its buttons.
Track Ball
It is used as an alternate of mouse. The user has to move its ball in order to utilise it that causes the pointer to move on the screen.
Joystick
It is very popular among the people found of computer games, but today different types of game conditions are replacing them gradually. Joystick is used to control the machine such as crane in the process of building constructions.
Digital Camera
Digital camer can take the images and also records the videos. The images and videos taken by digital cameras are recorded in files. These files can get copied into the computer that can be further edited for many purposes.
Microphone
Microphone is used to input the sound. It can be used to enter text in any word processing application with the voice recognition software in the computer.
Touch Screen
There is a network of light rays in touch sensitive visual display unit or in screen that recognises the touch. Touch screen is used inn many mobile phones. They are often used in cash machine and shopping centres.
Video Digital
Video digital takes the images from video camera or television and stores it into the computer for further use. The video sequences taken by video digital are mainly used in multimedia presentation.
Scanner
Scanner is used to convert an image into its digital form. It is similar to photocopier but it makes digital copy of an image instead of its hard copy. It is used to scan the text with the software optical character recognition.
Graphic Tablet
There is a flat pat on the graphic tablet upon which an user writes with the help of a special pen. Pictures can also be drawn on the screen using that pen in this way.
Keyboard
Keyboard is the most commonly used input device in computer.There are three types of keys on the Keyboard:
Alphanumeric keys
Special keys
Function keys
Alphanumeric keys include the whole alphabets from A to Z and digits from 0 to 9 and different characters such as space, / x ' ; @ # $ % ^ & - + = {} [ ].
Special keys include ENTER, Backspace, Delete, Shift, Caps Lock, Ctrl, Alt, etc.
Keys from F1 to F2 in the keyboard are known as function keys.
Mouse
It is the most popular point and draw input device which is connected to a terminal or microcomputer through a cable wire.
Output Devices
The means through which computer gives output are known as Output Devices.
Some of the most popular output devices are as follows:
Monitor
Printer
Projector
Sound Card
Speaker
Video card
Monitor
Video display screen fixed in hard layer and computer is also known as Monitor or video Display Terminal. Monitor means only that devices in which there is no any electronic device other than the device required for showing the image.
Printer
Printer that external hardware device which gives the output in printed format after receiving data from computer.
This is such an operated external device used with computer that prints text, image or photo.
Projector
Projector is that hardware device which projects an image on the flat surface like computer screen. These devices are generally used in meetings, seminars and presentations because each person can easily see the image projected by it sitting in a big room.
Sound Card
It is also known as sound board or audio card. Sound card is an expansion card or unified circuit that enables of computer to produce sound through speaker or headphone.
Speaker
It is the device which presents the sound produced during any programme. This is connected to sound card and give the sound produced by card in the form of output.
video Card
It is also known as Graphics Card. Video Board or Video Controller. This is an external circuit board that allows the image displaying devices like monitor to display the images.
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