Usage Of Computer Hardware

Done by

Er. Monika Ahuja

Army Public School Gwalior

Computer Hardware

Topic Summary

• INPUT DEVICES

• OUTPUT DEVICES

• STORAGE DEVICES

Computer Hardware

INPUT DEVICES

Introduction

• Input devices are used to enter data or commands in a form that

computer can use.

• They send the data or commands to the processing unit.

• According to type of the data they input , they can grouped into the

following:

• Text input devices

•Pointing input devices

• Imaging input devices

•Biometrics input devices

Text Input Devices

• Keyboard :- Usually a standard keyboard has between 80 to 110 keys

• MICR Reader

• OCR and Optical Readers

• OMR and Barcode Readers

• Magnetic Strip Card Readers

Pointing Devices

• Mouse

• Trackball

• Light Pen

• Touch Screen

• Touchpad

• Joystick

IMAGING DEVICES

• Image Scanner

• Digital camera

• Digital Video (DV) Camera

• Web Cam

• A scanner is a light sensing input device that converts the hard copy

documents, image or photograph to a soft copy(electronic version)

which can then be stored on a disk. The scanned copy( soft copy)

always in the form of image so its extension is .jpg/jpeg

• To scan the hard copy of any document it is required to install the

software in respective computer.

Image Scanner

Scanner

Biometric Input Device

• A biometric device translates a biological personal characteristic

into a digital code that is stored or compared with the digital

code that is stored in computer.

• Fingerprint Scanner

• Face Recognition Systems

• Signature Verification Systems

OUTPUT DEVICES

Introduction

An output device is an electromechanical device that accepts data

from a computer and translates them in suitable form for the users.

• Printer

• Plotter

• Monitor

• Projector

• Voice response system

Printer

The printer is a device that print the text document and image on the

paper.

• Dot Matrix

• Inkjet

• Laser Printer

Plotter

A plotter is an ideal output device for architects, engineers, and others

who need to routinely generate high-precision, hard-copy, graphic

output of widely varying sizes.

• Drum Plotter

• Flatbed Plotter

Projector

• Screen image projector is an output device used to project information

from a computer on a large screen

• Like monitors, screen image projectors provide a temporary, soft-copy

output

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