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Submitted to: Sir. Fahad JavaidGroup members:

Hafiz FaisalShafqat Mahmood Taifoor NazarAbdul SammadQaisar Khan

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COMPUTER HARWARE

1 • Input Devices

2 • Output Devices

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Hardware:- “The Physical parts of Computers are called Hardware.” Components of Computers:• Input devices such as Keyboard, mouse, joystick etc.• The central processing Unit (CPU)• Output devices such as printer, monitor etc.• Storage devices such as disk drive, hard drive etc.• Communication devices.

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1.Input Devices “It is hardware component that is used to enter data

and instructions into a computer.”• Keyboard• Mouse• Track Ball• Touch Pad/Track Pad• Graphics Stick• Touch Screen• Digital Scanner• Digital Camera• Light Pen• Joystick• Pen-Base Computer System• Microphone

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Some of these are given as…1. Keyboard• QWERTY layout• Numeric keypad• Function keys• Arrows keys

2. Mouse• Input instructions with a pointer on screen• Two or three buttons and a scroll wheel• Movement of cursor depends on movement of small ball• Optical Mouse technology3. Track Ball• Alternative to mouse in function• Have rotating ball on top• Ball is rolled with fingers so whole body not moved

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4. Touch Pad• Small, flat surface over which user moves finger• Movement of finger moves cursor• Also known as Track Pad• Buttons work like mouse button

5. Digital Scanner• Read pictures and other printed material and then translate

into digital form and store• Use laser technology• Scanned picture can be printed, display on screen, sent via Email

6. Microphone• Used to digitally record data like Human voice• user input text and command orally• Software application convert sound waves into digital form• Digital form Stored and used later

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2. Output Devices “The hardware components that are used to receive information from

the computer.” • Soft Copy Output: The output shown on display screen is called

Soft Copy Output.• Hard Copy Output: The output printed on paper is called Hard

Copy Output.

Example of Output Devices• Monitors • Plotters• Speakers• Printers

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1) Monitors• Most common output device• The output displayed by monitor is called soft copy• A monitor is also known as display screen or simply screenFeature of Monitor• Size• Color• Resolution• Refresh rate• Dot Pitch• Video Display AdapterTypes of Monitor1. Flat panel monitors • These monitors take less space• LCD (Liquid Crystal Display)• Active Matrix Display/The Film Transfer monitor(TFT)• Passive Matrix Display/dual-scan monitor

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2. Touch Screen Monitor• Used as input and output• Detect touch of finger• Used in ATM• Show Soft copy

3. CRT Monitor• Most common form of display screen• It looks like a television • It can display text and graphics.

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2) Printers• It prints character, symbol, graphics on paper• Printed output is called hard copy• Printers with high dpi produce higher quality output Characteristics of Good Printer• Speed• Clarity and Quality• User Friendly• Reliability

Categories of Printers1. Impact Printers• Looks like a typewriter• Oldest technology• Slow and low cost than non-impact printers• Print Quality is less than non-impact printers• Prints by striking a print hammer or set of pins against an

inked ribbon, the inked is pressed from ribbon to paper as output

• e.g. Dot matrix, Daisy wheel and line printer

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2. Non-impact Printers

• Print graphic and character on paper without striking paper• It sprays ink or create imager with heat and pressure• Fast and more cost than impact printers• Produce less Noise• Print Quality more than impact printers• e.g. Laser printer, inkjet printer, Thermal printer

Laser printer Inkjet printer

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3) Plotter• Produce High Quality graphics in variety of color• Used to create Maps, architectural drawing, graphs and

charts• Draw Lines by pen in mechanical arms Types of Plotters Different types are as follows...1) Flatbed Plotter2) Drum Plotter

Flatbed plotter Drum Plotter

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4) Speakers Speakers and Headset are audio output, and “Output produced in form of sound, voice or music known as

audio output”.• Internal speaker of computer• Sophisticated stereo speaker are of good quality• Woofer boost low base sound• Headset are also audio output

5) Data Projector “It is an output device that projects the output of computer screen onto a larger screen”. Types:• LCD Projector• DLP Projector

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