Input and output devices (Qaisar)

Input and output devices (Qaisar)

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  1 Submitted to: Sir. FahadJavaid Group members: Hafiz Faisal Shafqat Mahmood Taifoor Nazar Abdul Sammad Qaisar Khan
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  COMPUTER HARWARE 2 • InputDevices • Output Devices
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  3  Hardware:- “The Physicalparts 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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  4 1. Input Devices “Itis 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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  5 Some of theseare 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 technology 3. 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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  6 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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  7 2. Output Devices “Thehardware 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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  8 1) Monitors • Mostcommon output device • The output displayed by monitor is called soft copy • A monitor is also known as display screen or simply screen Feature of Monitor • Size • Color • Resolution • Refresh rate • Dot Pitch • Video Display Adapter Types of Monitor 1. 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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  9 2. Touch ScreenMonitor • 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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  10 2) Printers • Itprints 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 Printers 1. 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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  11 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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  12 3) Plotter • ProduceHigh 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 Plotter 2) Drum Plotter Flatbed plotter Drum Plotter
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  13 4) Speakers Speakers andHeadset 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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