Input and Input Devices

INPUT

Every thing which is told by the user to the computer system is called input.

INPUT DEVICES

Input devices are hardware components that are used to enter the data or instruction into the computer system. Most common input devices are Key board, Mouse, Touch Pad, Light Pen, Digital Camera, Microphone and Scanner

• KEYBOARD

Keyboard is very important but common input device. It is like a type-writer. Computer can’t work without keyboard. It consist of Alphabetic keys (Aa-Zz), Numeric Keys (0-9), Function keys (F1-F12) and some other keys to enter the different data or instruction. A standard keyboard has 101 to 104 keys.

• MOUSE

Mouse is an input device which is rolls on the flat surface and controls the mouse pointer. Mouse pointer uses to select the text, Menu and Icon. Mouse pointer moves on the screen as the mouse rolled on the mouse pad. It has two button and scroll wheel. Button can be clicked or doubled clicked to perform the tasks. Scroll wheel use to scrolling the long documents.

• MOUSE EVENT

Mouse Event is a process which is performed by the mouse. There are there event like, Right click, Left Click and Drag.

Right Click: It is use to view the proprieties of File, Folder and Desktop etc

Left Click: It is use to select the graphical object like File, Icon, text in the document and other button

Drag: it is use to move the object or text form one place to another place.

• TRACK BALL

Track Ball is a pointing device which is work like mouse. We can use it as an alternative to mouse. It is use in portable computer. It has three buttons which are work like mouse button. It has rolling ball on the top which is controls the cursor position and it needed less space for working.

• JOY STICK

Joy stick is an input device which is help to play the video games on the computer. It is like mouse and it has two buttons which are called Triggers.

• TOUCH PAD

Touch pad is a pointing device which is small area of flat surface. The surface is very sensitive to motion and pressure. Pointer moves on the screen when finger rotate on touch pad.

• LIGHT PEN

A light pen is also pointing device which is looks like pen. It is handed hold and is connected with compute via wire. When user touches the some specific area of screen with light pen it sends information to the compute system. Generally graphics designer, Engineer and other persons are used this device.

• DIGITAL CAMERA

Digital camera is an input device that is used to enter input directly into the computer system. Picture and video taken by the digital camera and store them on computer disk or memory chips then they give to computer for processing. These video or picture can be edited or change by the computer for user desire. We can made picture or video in less time and low cost using to digital camera because do not need to the film processing.

• MICROPHONE

Microphone is an input device which is used to enter the human voice or another voice into the computer system. A sound card within the computer converts the sound in that form which are understandable by the computer. Computer store it or send to the speaker for user’s listening.

• SCANNER

Scanner is also an input device which is work like copy machine. Scanner is used to enter the print document and images into the computer system. Scanner captures an entire sheet and converts into digital signals. Scanned image can not be edited, special software are used for editing in it.