* Input Units.

* Output Units.

* Storage Units.

The physical elements of a computer, its hardware, are generally divided into :

Any machine that used to transfer data from the outside world into a

computer system such as a keyboard, scanner, mouse or

digitizer tablet .

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboardFirst page

camera

keyboard

A keyboard is made up of individual keys representing individual letters, numbers, and symbols.

First page

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

A mouse is a small plastic box with buttons on top and a rolling ball or optical 'reader' underneath.

Ball mouse

• Mechanical mouse.

• Optomechanical mouse.

• Optical mouse; (Uses a laser).

First page

There are three basic types of mice :

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

First page

scannersA device that can electronically read text or pictures and save them in a format where they can be used in other packages such as Word.

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

photomultiplier tubeFlatbed scanners

Sheet-fed scanners

Handheld scanners

Drum scanners

An input device that utilizes a light-sensitive detector to select objects on a display

screen. A light pen is similar to a mouse, except that with a light pen you can move

the pointer and select objects on the display screen by directly pointing to the objects

with the pen.

First page

light pen

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

A camera that stores images digitally rather than recording them on film

Types of digital cameras

First page

Digital Camera

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

Ultra compact digital cameras

Compact digital camerasAdvanced digital cameras

A computer monitor (a touch-sensitive) attachment that can sense the location at which a viewer touches the screen to respond to a question or prompt in a script. You can use your finger to operate it.

There are three types of touch screen technology:

First page

Touch Screen

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

ResistiveSurface waveCapacitive

Capture notes and images from the marker board! Increase efficiency and participation, reduce meeting time by eliminating notetaking-save,

print, archive and distribute meeting notes .

Increase efficiency by saving time, printing, distributing and archiving meeting notes

First page

Electronic Board

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

Used mostly for computer flight simulators and action games, a joystick is an input device that transfers movements you make with

the device into movements on your computer screen .

First page

Joystick

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

A device that converts sound waves into analogous electrical waves .

First page

Microphone

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

Types of MicrophonesCarbon microphones

Dynamic microphones

Ribbon microphonesCondenser microphones

Crystal microphones

Bar Code A Bar Code is just a different way of encoding numbers and letters by using a combination

of bars and spaces of varying widths .

Types of Bar Code reader:

-Pen Type Readers or Bar Code wands-Laser Barcode Scanners- CCD Barcode Scanners-Camera Based Barcode Readers

barcode reader

First page

Touch screen Electronic board joystick Bar code

Light penscannermouse

microphone

keyboard camera

First page

printer plotter speakersmonitor

Equipment that receives electrical pulses from the computer and either causes an action to occur, generally in controlling the manufacturing process functions, or passively records data.

A display screen used to present output from a computer.

LCD (Liquid Crystal Display)

First page

printer plotter speakersmonitor

Computer monitor

CRT (Cathode Ray Tube)

A printer outputs data that is seen on the computer screen A device that prints text or illustrations on paper..

Some types of printers.

First page

printer plotter speakersmonitor

Printer

Ink-jets (bubble-jets) printers Laser printers LED/LCD printers  

PlotterA plotter is a printer that interprets commands from a computer to

make line drawings on paper with one or more automated pens .

Plotter Types:

First page

printer plotter speakersmonitor

Pen PlottersInkjet Plotters

An electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance. Synonymous with loudspeaker.

Types of Speakers:

First page

printer plotter speakersmonitor

Speaker

Coaxial SeparatesHorns Separates

Subwoofers Separates

Computer data storage, often called storage or memory, refers to computer components, devices, and recording media that retain digital data used for computing for some interval of time. Computer data storage provides one of the core functions of the modern computer, that of information retention

First page

Hard disc CD Tape Drives USB flash discFloppy disc

Floppy disk

Floppies come in three basic sizes : ·8 - inch: ·5-¼inch: ·3-½inch:

A floppy disk is a data storage medium that is composed of a disk of thin, flexible ("floppy“).

First page

Hard disc CD Tape Drives USB flash discFloppy disc

hard disk drive (HDD), commonly referred to as a hard drive, hard disk or fixed disk drive,[1] is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces.

First page

Hard disc CD Tape Drives USB flash discFloppy disc

Hard disk

CD is an optical disc used to store digital data, originally developed for storing digital audio .

Some variations of the CD include :CD-ROM CD-i CD-RW CD-ROM XA CD-W Photo CD Video CD

First page

Hard disc CD Tape Drives USB flash discFloppy disc

Compact Disc

A device, like a tape recorder, that reads data from and writes

it onto a tape .

Computer Tape Drives-Tape drive ABCs

-Tape drive standards -Other Backup Solutions

-Technical Support -Tape definitions

First page

Hard disc CD Tape Drives USB flash discFloppy disc

Tape drive

USB flash driveA USB flash drive is a NAND-type flash memory data storage device

integrated with a USB (universal serial bus) connector. USB flash drives are typically removable and rewritable, much shorter than a floppy disk

(1-4 inches or 25-102 mm), and weigh less than 2 ounces (56 g) .

n.) A small, portable flash memory card that plugs into a computer’s USB port and functions as a portable hard drive. USB flash drives are touted as being easy-to-use as they are small enough to be carried in a pocket and

can plug into any computer with a USB drive

First page

Hard disc CD Tape Drives USB flash discFloppy disc

USB flash drive