Input and Output Devices

Topics: Input device, Hard disk drive, Computer Pages: 7 (1045 words) Published: September 1, 2014
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An input device is a hardware used to send data to a computer . input device allows users to communicate for processing , display , storage and transmission SEVEN COMPUTER INPUT DEVICES THAT WE HAVE ARE AS FOLLOWS:

KEYBOARD
A computer keyboard is an input device used to enter characters and functions into the computer system by pressing buttons or keys.it is the primary device used to enter text. A keyboard is used to enter text . a keyboard typically contains keys for individual letters, numbers and special characters ,as well as keys for specific functions. A keyboard is connected to a computer system using a cable or a wireless connection. They are different types of computer keyboards whereby a normal keyboard is composed of around 110 keys. They are also four major keyboard layout being used worldwide QWERTY,AZERTY,QWERTZ and HCESAR but they can be classified in many more different categories depending on the types of computer connector ,size, number of keys.We have different types of keyboards which are ADB (Apple Desktop bus, XT,MINI , MULTIMEDIA keyboard and lastly the internet keyboard wireless keyboard, gaming keyboard, membrane keyboard.

MOUSE
This is an input device designed to manipulate objects on the computer screen. Computer mice come in many shapes and sizes but all designed to fit either the left or right hand. And a scroll wheel, are integrated onto the mouse to provide a wide variety of functions. This also allows the user to select items stored on a computer and, subsequently perform actions on those items .mice communicate with the computer either wirelessly or wired.

SCANNER
A scanner is a device that captures images from photographic prints, posters, and similar sources for computer editing and display. When a document is scanned ,it is converted into a digital format. And this creates an electronic version of the document that can be viewed and edited on a computer. scanners can be small ,hand held units or large capable of scanning a large image. And most scanners come with a basic software which imports data from scanners needed to do this. And there are many brands of imaging software .they many types of scanners which includes flat –bed devices which have a flat scanning surface .another type of scanner is the sheet-fed scanner which can only accept paper documents. Photo scanners which are meant for scanning photos, sheet fed scanners, portable scanners.

LIGHT PEN
A light pen is a computer input device in the form of a light sensitive wand used in conjunction with a computersmonitor.it allows the user to point to displayed objects, draw on the screen in a similar way to a touchscreen but with greater positionalaccuracy.it works by sensing the sudden small change in brightness of a point on the screen.

TOUCHSCREEN
A touch screen is a computer display screen that is also an input device. The screens are sensitive to pressure , a user interacts with the computer by touching pictures or words on the screen. They are three types of touch screen technology which are resistive, surface wave and capacitive.

MICROPHONE
This is an input device that changes information from one form to another .sound information exists as patterns of air pressure .the microphone changes this information into patterns of electric current.

TOUCHPAD
This is a computer input device for controlling the pointer on a display screen by sliding the finger along a touch –sensitive surface. Touchpads are chiefly in laptop computers.it is an alternative to the mouse .

An output device is any device used to send data from a computer to another device or user. Most computer data output that is meant for humans is in the form of audio or video. Thus, most...
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