1. Computer Concepts Lesson 2 Computer Technology

2. Output Devices • Return (to you) processed data in form of information • View and use information

3. Types of Output Devices • Monitor • Printer • Speakers • Earphones

4. Pixel • Pixel – picture element, a single point in a graphic image

5. Monitor Clarity • Resolution • Sharpness of image • Pixels per square inch • 800 x 600 = large display • 1280 x 1024 = small display

6. Printers • Dot Matrix - impact • Inkjet • Laser – black and white or color • Plotter

7. Printer Comparison

8. Laser Printers - Operation • Prints series of dots created on a drum (like a copy machine) • Uses toner – magnetically charged ink • Produces highest-qualityprintouts • Black or Color • A workhorse—for those who print a lot

9. Inkjet Printer - Operation • Squirts liquid ink on page. • Prints on a variety of media • Good for invitations, flyers, brochures, photos • Slower than laser printers • Photo printers, all-in-one’s

10. Dot Matrix Printers - Operation • Prints by striking mechanism against ribbon, similar to typewriter. • Draft or NLQ (near letter quality) • Creates inexpensive drafts (not good for final documents) • Produces lower resolution than laser or ink-jet. • 9-pin • 24-pin

11. Communications and Networks Media that connects networked computers • Wired – telephone lines or cable • Wireless – microwaves, satellites, and radio waves

12. Internet Connectivity • Dial-up – 56 Kbps • DSL – 128 Kbps - 300 Mbps • T1 – 1.5 Mbps • T3 – 44.6 Mbps • Fiber Optic – 5 Mbps – 50 Gbps Leased from telephone company (copper or fiber optic)

13. Fiber Optics • Transmitting information from one place to another by sending pulses of light through an optical fiber.

14. Networks and the Internet • Network – connected computers and devices • LAN – local area network • Share printers and files • WAN – wide area network • Network Interface Card – NIC • Connectivity hardware placed in expansion slot. The blinking light on the outside of your computer tells you the NIC is active and has network connectivity. • Internet – world’s largest network

15. Software

16. Types of Software • Operating Software • Tells computer how to operate • Application Software • Programs that perform specific tasks

17. Operating System Software • Purpose • The purpose of an operating system is to organize and control hardware and software so that the device it lives in behaves in a flexible but predictable way. • Examples • Microsoft Windows 8, 7, XP • Mac OS • Unix • Linux

18. Word Processing Spreadsheets Database Management Communications Personal Finance/Accounting Graphics Desktop Publishing Computer-aided Design Antivirus Web Design Application Software Categories

19. Multitasking is . . . • the apparent simultaneous performance of two or more tasks/programs by a computer's central processing unit

20. Icons • Small picture or graphic object that represents a program , file, command or web page • Most computers functions in a GUI (graphical user interface) are represented by a function icon. • The icon must be original, distinctive, and tiny.

21. GUI • Pronounced: gooey • A type of user interface that allows users to interact with programs in more ways than typing • A GUI offers graphical icons, and visual indicators, as opposed to text-based interfaces, typed command labels or text. • The actions are usually performed with • Touch • Mouse

22. DOS (Disk Operating System) • Command line operating system • What Mrs. Brunson grew up with (at the time it was so cool because we didn’t know any better) • Still used for advanced networking and disk management functions