Presentation on Input and Output device of computer- Shama

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Presentation on Input and Output device of computer

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Presentation On Input and Output devices Presented By : Submitted Date: 19 th December Shama Ansari

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Presentation Outlines : Input Units Keyboard Mouse Microphone Joystick Scanner Joypad Output Units VDU (Visual Display Unit) Printer * Daisy-wheel * Dot-Matrix * Ink-Jet printer * Laser Plotter Speaker Modem

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Input Devices : An input device is any device that provides input to a computer. There are dozens of possible input devices, but the two most common ones are a keyboard mouse. Input devices convert the user’s action and analog data (sound, graphics, pictures) into digital electronic signal that can be processed by a computer. Without input devices, a user would not be able to feed instructions to a computer.

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Mouse: Mouse is a point and click input device with two or three buttons which controls the movement of the cursor or pointer on a display screen. The first mouse was built in 1968 by Douglas Engelbarts at Standford Research Institute. Its name is derived from its shape, which looks a bit like a mouse, its connecting wire that one can imagine to be the mouse's tail.

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There are three types of mouse : Mechanical Mouse : The mouse which has rubber or metal ball under it which rolls in all direction is mechanical mouse. Optical Mouse : It uses the laser to dictate the mouse’s movement Uptomechanical Mouse : It’s same as the mechanical mouse but uses the optical sensor to dictate the motion.

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Keyboard : It is simply a set of typewriter like keys that allows us to enter the data into the computer. Computer keyboard are similar to the electric typewriter keyboard but it contains additional keys. The keys in the keyboard are classified into 3 groups : Alpha Numeric Keys Special keys Punctuation Keys

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Microphone: A microphone is a device that converts mechanical energy (Sound or wave) into electrical energy. Microphone is a part of everyday life. They are use in computer during the video conference call, chatting, etc. There are different types of microphones. Mostly they are used in mobiles, computer, radio, tape recorder etc .

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Joypad Joypad is similar to joystick. It is designed for gaming input. It has multi-directional touch pad. It is most commonly used with games consoles but also suitable for computers. It also normally has additional buttons or switches that are used in addition to the stick.

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Scanner Scanner is an input device. It is used to enter pictures, graphs and other documents in computer and allow saving in different formats. It has two main components: Data capturing sub system: is used to illustrate image and convert into optical form. Image Processing Subsystem: is used to convert optical image into digital.

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Joystick There have been many different types of game controllers used in the history of computer games. The most popular controller has been joystick, which is simple a box with button and stick to control the motion in the game. Therefore, it is a lever that moves in all directions and controls the movement of a pointer or some other display symbol .

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Output Device An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.

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VDU (Visual Display Unit ) / Monitor Monitor or VDU( Visual Display Unit) is an output device used to display data and information. It plays vital role for users to know the outcome of the raw data given to the computer.

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Types of VDU : CRT : It is a most common type of display. CR%T is simply a glass container having cathod at one end and device called an electtrogan that protects the beam of cathod. LCD : CRT monitor is reliable but it consumes more power, small in size and doesn’t flick. Plasma Display Pannel : It is a flat pannel which is commonly used for large T.V. display (Normally more than 37”)

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Printer A printer is a device that prints text or illustrations on paper. Generally, it produces hard copy on the plain paper. The printed output is referred to as hardcopy because it is in relatively permanent form. There are many types of printers and some of them are: Daisy-wheel Dot-Matrix Ink-Jet printer Laser

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Plotter It is used to draw pictures on paper based on commands from a computer. Plotters differ from printers in that they draw lines using a pen. They can produce continuous lines. Plotters are used in engineering applications. They are more expensive than printers.

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Speaker Speakers are the output devices that let us hear sounds that are played on a computer. Sounds are the source of information so speakers therefore send out information.

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Modem Modem is most common type of communication processor MODEM is an electronic device that converts digital signal into analog and vice versa. Two types of modem: Modulator:-it coverts digital signal into analog. Demodulator:- it converts analog signal into digital signal.

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