Input Output Devices

1. Input Output Devices Sneha

2. Topics to be discussed Input Devices Example of input Devices Keyboard Mouse Joystick Tracker Ball Light pen Digital Camera Output devices Monitor Printer Plotter Audio Output:sound card and speaker

3. Input Devices Input is any data entered into the computer’s memory. Input Devices are used to enter the input into the computer back

4. Example of input Devices back Keyboard Mouse

5. Keyboard The keyboard allows the computer user to enter words, numbers, punctuation, symbols, and special function commands into the computer’s memory. back

6. Types of keyboard Enhanced or Extended keyboard – Typically 101 keys laid out in the QWERTY fashion; connected to the computer by a cable Cordless keyboard – Uses infrared or radio wave signals Ergonomic keyboard – Designed to help prevent cumulative trauma disorder (CTD) or damage to nerve tissues in the wrist and hand due to repeated motion

7. Mouse back The mouse is the most widely used pointing device. A mouse is palm sized. As the mouse is moved, its movements are mirrored by the on-screen pointer.

8. Joystick back It is also a pointing devices which is used to move cursur position on a monitor screen. It has a stick having a spherical ball at its both lower and upper end. Joystick can move in all four directions.

9. Tracker Ball back It is also an input device. It is mostly used in notebook or laptops. This is a ball which is half inserted and moved by using finger.

10. Light pen back It is a pointing device It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.

11. Digital Camera back • Digital cameras are used to: • Download images to a computer • Post pictures to the Web • Produce videos • Resolution is measured in megapixels. • Higher the resolution, better the image quality, but the more expensive the camera

12. Output devices back • Output devices take information within your computer and present it to you in a form that you can understand • Main output devices: • Monitors • Printers • Speakers

13. Monitor back • A monitor is a peripheral device which displays computer output on a screen. • Screen output is referred to as soft copy. • Types of monitors: • Cathode-ray tube (CRT) • Liquid Crystal Display (LCD or flat-panel)

14. Cathode-ray tube (CRT) Resemble televisions Use picture tube technology Less expensive than a LCD monitor Take up more desk space and use more energy than LCD monitors

15. Liquid Crystal Display (LCD) • Cells sandwiched between two transparent layers form images • Used for notebook computers, PDAs, cellular phones, and personal computers • More expensive than a CRT monitor • Take up less desk space and use less energy than CRT monitors • Types of LCD monitors: • Passive-matrix LCD • Active-matrix LCD • Gas plasma display • Field emission display

16. printer A printer is a peripheral device that produces a physical copy or hard copy of the computer’s output

17. Types of printer • Inkjet printer, also called a bubble-jet, makes characters by inserting dots of ink onto paper • Letter-quality printouts • Cost of printer is inexpensive but ink is costly • Laser printer works like a copier • Quality determined by dots per inch (dpi) produced • Color printers available • Expensive initial costs but cheaper to operate per page Inkjet printer Laser Printer back

18. plotter back A plotter is a printer that uses a pen that moves over a large revolving sheet of paper. It is used in engineering, drafting, map making, and seismology

19. Audio Output:sound card and speaker back • Audio output is the ability of the computer to output sound. • Two components are needed: • Sound card – Plays contents of digitized recordings • Speakers– Attach to sound card