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Technology In Action

Technology In Action. What is Computer Fluency?. To be computer fluent you must: Understand a computer’s capabilities and limitations Know how to use a computer. NEXT SLIDE. What is Computer Fluency?. Being computer fluent also helps you:

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Technology In Action

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  1. Technology In Action

  2. What is Computer Fluency? • To be computer fluent you must: • Understand a computer’s capabilities and limitations • Know how to use a computer NEXT SLIDE

  3. What is Computer Fluency? • Being computer fluent also helps you: • Use your computer more wisely and be more knowledgeable consumer • In your career • Better understand and take advantage of future technologies NEXT SLIDE

  4. Computers are Data Processing Devices • Four major functions: • Input data • Process data • Output information • Store data and information NEXT SLIDE

  5. Computer Hardware • Input devices • System unit (Processing devices) • Output devices • Storage devices NEXT SLIDE

  6. Bits and Bytes: The Language of Computers • Bit • Binary digit ( 0 or 1 ) • Byte • Eight bits • Represent letters, numbers, and special characters • b, KB, MB, GB NEXT SLIDE

  7. Data vs. Information • Data • A representation of a fact or idea. • A number, a word, a picture, a recording of sound • Information • Data that has been organized or presented in a meaningful fashion NEXT SLIDE

  8. Computer Software • Programs that enable the computer to perform different tasks • System software • Application software NEXT SLIDE

  9. Specialty Computers PDA Server • PDA • Server • Mainframe • Supercomputer Mainframe Supercomputer NEXT SLIDE

  10. Technology In Action Chapter 2 Looking at Computers: Understanding the Parts NEXT SLIDE

  11. Topics • Hardware components • Input devices • Output devices • System unit • Ergonomics NEXT SLIDE

  12. The Computer System • Hardware components: • System unit • Peripheral devices Monitor System unit Speaker Printer Microphone Mouse Keyboard NEXT SLIDE

  13. Input devices • Enable data and instructions to be entered into the computer • Types of input devices: • Keyboard • Mouse / pointing device • Microphone • Scanner • Digital camera NEXT SLIDE

  14. Keyboards • Popular keyboard layouts: • QWERTY • Dvorak NEXT SLIDE

  15. Multimedia Internet Toggle and other keys Function keys Numeric keypad Arrow keys Windows keys Enhanced Keyboard • Standard alpha-numeric keys • Specialty keys NEXT SLIDE

  16. Specialty Keyboards • Laptops • PDAs • Wireless • Infrared • RF • Ergonomic Laptop PDA Ergonomic NEXT SLIDE

  17. Mice • Types of mice: • Standard • PS/2 • USB • Cordless • Optical • Trackball Standard Wireless Trackball Optical NEXT SLIDE

  18. Other Pointing Devices Pointing stick Touch screen • Pointing stick • Touch screen • Touchpad • Joystick • Stylus Touchpad Joy stick Stylus NEXT SLIDE

  19. Inputting Sound • Microphone • Speech-recognition • Videoconferencing Microsoft Office Speech Recognition Tool NEXT SLIDE

  20. Other Input Devices Handheld • Scanners • Text • Images • Digital cameras • Images • Video Flatbed Camcorder Camera Web cam NEXT SLIDE

  21. Output Devices • Enable us to view or hear the processed data • Types of output devices: • Monitors • Printers • Speakers NEXT SLIDE

  22. Monitors • Cathode-ray tube (CRT) • Liquid crystal display (LCD) • Passive-matrix • Active-matrix LCD CRT NEXT SLIDE

  23. CRT Monitors • Uses picture tube technology • Screen size – Diagonal measurement of the screen (15, 17, 19, 21) • Resolution – Sharpness of the image determined by the number pixels that the screen can display (800 x 600, 1024 x 768, 1600 x 1200) • Refresh rate – Speed at which the screen is refreshed (60Hz, 75Hz) NEXT SLIDE

  24. Polarizer Color filter Color filter glass Liquid Crystal Glass polarizer Backlight Liquid Crystal Display • Liquid crystal sandwiched between two transparent layers form images • Used for notebook computers, PDAs, cellular phones, and personal computers NEXT SLIDE

  25. CRT MONITOR ADVANTAGES Images viewable from all angles (LCD monitors often have limited viewing angle) Resolution can be adjusted more completely Better color accuracy and clarity Less expensive than LCD monitors Better for gaming and watching DVDs due to quicker pixel response time and higher color accuracy LCD MONITOR ADVANTAGES Take up less space and weigh less than CRT monitors Cause less eyestrain than CRT monitors More environmentally friendly than CRT monitors Larger viewable area compared with similar sized CRT (17-inch viewable area on 17-inch monitor compared with 15-inch viewable area) CRT vs. LCD Monitors NEXT SLIDE

  26. Physical Size Weight Power Heat output Display area Image quality Image distortion Aesthetics CRT Vs. LCD

  27. Printers • Impact printers • Dot-matrix • Nonimpact printers • Inkjet • Laser • Multifunction • Specialty printers • Plotters • Thermal printers NEXT SLIDE

  28. Speed: Pages per minute (ppm) Inkjets print 2-6 ppm Lasers print 20-30 ppm Resolution: Image clarity Dots per inch (dpi) 300 dpi for general printing 1200 dpi for printing photos Color output: Quality of color images Inkjets use 4 or 6 color cartridges Lasers use separate color toner cartridges Memory: Inkjets need 4-8 MB Lasers need 16 MB Cost: Inkjets are inexpensive Lasers are more expensive Choosing a Printer NEXT SLIDE

  29. Example: ink-jet printer Epson Stylus C83 Ink-Jet Printer • Technology (Detailed): Inkjet • Max Resolution (BW): 5760 x 1440 dpi • Max Resolution (Color):5760 x 1440 dpi • Black Print Speed: 22 ppm • Color Print Speed: 12 ppm • Cartridges: four (cyan,magenta,yellow, black) • Platform: PC, Mac • Media Type: • Bond Paper • Plain Paper • Thermal Paper • Transparencies • Max Media Size: Folio (216 x 330 mm, 8.5 x 13")

  30. Outputting Sound • Inexpensive speakers • Sophisticated sound system • Surround sound • Subwoofer NEXT SLIDE

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