Objectives - Chapter 1 After reading this chapter, you should be able to answer the following questions: 1.What does it mean to be computer literate? (p. 3) 2.How does being computer literate make you a savvy computer user and consumer? (pp. 45) 3.How can becoming computer literate help you in a career? (pp. 521) 4.How can becoming computer literate help you understand and take advantage of future technologies? (pp. 2123) 5. What kinds of challenges do computers bring to a digital society, and how does becoming computer literate help you deal with these challenges? (pp. 2324) Chris McDougall 3 Hours o After class o can be arranged o set up an appointment Chapter 2 Looking at Computers: Understanding the Parts 4 Functions of a computer Data versus information Bits and bytes Input devices Output devices System unit* Ergonomics* 5 Computer Electronic device that performs 4 major functions, input, process, output, and store data takes data and converts it into information Data: words, numbers, sounds, pictures, facts, ideas Information: processed/organized data presented in a meaningful way 2-50 Input Process Output Storage 2-50 Data: Representation of a fact or idea Information: Organized, meaningful data 8 Organized and presented in a meaningful way If a telephone book is not alphabetized is it data or Information? 9 Computer Language is in 0s and 1s Bit Is short for Binary digit Is either a 0 or 1 Byte Eight bits Each letter, number, and character = a string of eight 0s and 1s Example: = K = 8 bits Megabytes: around 1 million characters Gigabytes: around 1 billion characters Terabytes: around 1 trillion characters Petabytes: - around 1 quadrillion characters Who uses terabytes?? 2-51 Wal-Mart E-Bay Nielsen Media U.S. Library of Congress Ancestry.com Not just bigger we are going faster.. Wal-mart refreshes sales data hourly Information Weekly A book without words or a CD without music? Software: are programs that enable the monitor, processor, printer to perform different tasks. Application software: specific task System software: enables hardware devices and application software to work together Operating System Windows XP Mac-OS Windows Vista 16 Devices used to enter information or instructions into the computer Keyboard Mouse/pointing device Microphone Scanner Digital camera Stylus The QWERTY layout is standard on most PCs Designed for a typewriter - created to SLOW down typists to prevent jams Inefficient slows down typists 19 Dvorak layout puts the most commonly used keys on the middle row Reduces distance of finger stretches 2-53 Personal Digital Assistant Stylus Built in keyboard Tablet PCs Stylus Touch sensitive screen Handwriting recognition Wireless keyboard Unattached battery RF or Radio Frequency 6 to 30 feet away (radio waves no pointing) 20 Stylus: pen shaped device Tablet PC Numeric keypad enter numbers quickly Control key (CTRL) Used in a combination with other keys Function keys (F1, F2) Perform specific tasks Each software application has its own tasks F1 is usually help but F2 is different in Word/Excel Toggle keys Turns a function off or on Example: insert key on/inserts off/replaces text Touch pad Interprets taps as mouse clicks On notebooks or laptops Optical mouse Internal sensor or laser Needs no mouse pad Doesnt need cleaning Most common now Trackball Easier on wrists Stays stationary on desk Wireless Use radio or light waves EPOS Digital Pen Web Cam Transmit live video over the web Physically Challenged Voice recognition Keyboards with larger keys trackballs 23 EPOS Microphones used for: Podcasts: a clip of audio or video Video-conferencing Internet phone calls Speech recognition 24 Send processed data out of the computer Monitors Printers Output devices make: Soft copies - video, sounds, control signals Hard copies (print) CRT Cathode Ray Tube Less expensive Use much more space Use more energy Offer better viewing angles LCD Liquid Crystal Display Most popular Use far less space More energy efficient Less viewable angles 26 Screens are grids made up of millions of pixels. Pixels are tiny dots colored RED BLUE GREEN. Resolution is the images clearness or sharpness. Most important factor to consider with a LCD The higher the resolution, the sharper the image. 1,600 x 1,200 1,600 vertical columns with 1,200 pixels Impact printers Dot-matrix Nonimpact printers Inkjet: spray ink Laser : use laser beams Wireless printers Uses blue tooth technology Notebooks, cameras Specialty printers Multifunction Plotters: oversize images Thermal printers: wax transfer Inkjet Less expensive device Print high-quality color images cost effectively Laser More expensive device Faster printing speed Less expensive per page in Black & White Color lasers are becoming less expensive 29 Factors to Consider Speed - ppm or pages per minute Resolution - dpi or dots per inch Color output best individual cartridges Memory Use and cost Cost of consumables cost of cartridges 4 functions of a computer Data versus information Bits and bytes Input devices Output devices System unit* Ergonomics* 31 Power control Drive bays Memory card reader Productivity ports Permanent (nonvolatile) storage Internal or external versions Stores the largest capacity for a CD 34 Flash drives (jump drives/removable drives) Newer storage alternative Plug into USB ports Portable Flash memory cards Slide into slots in the system 36 Larger phone jack - Internet Cable Fastest Mp3 Check out your computer and fill in the Drives and Ports paper. 2009 Prentice-Hall, Inc.37 External hard drives, video cameras Keyboards, ipods, speakers An internet connection gives access to a cable or DSL modem. Also connects to network servers and printers. Newer version Referred to as the brains of the computer Controls all functions of the computer Processes all commands and instructions Can perform billions of tasks per second 41 Random access memory (RAM) Stores instructions and data Temporary (volatile) storage Operates in nanoseconds Read only memory (ROM) Holds all the instructions the computer needs to start up. Non-volatile storage 42 Ergonomics Equipment that maximizes productivity and minimizes fatigue Monitor Position 25 inches from your eyes At eye level Wrists should be flat Forearms parallel to floor Take Breaks Adequate Lighting Adjustable Seating 2-77 Objectives - Chapter 2 (continued) After reading this chapter, you should be able to answer the following questions: 5. Whats on the front of your system unit? (p. 69) 6. Whats on the back of your system unit? (p. 72) 7. Whats inside your system unit? (p. 75) 8. How do you set up your computer to avoid strain and injury? (p. 77) Hand In Write down your answers on a piece of paper. You can use your book for help not each other for this exercise Pages 85/86 1. Word Bank 2. Self-Test 3. True/False 45 Listen to SoundByte Port Tour: How Do I Hook Up? with your Head phones Answer Handout Multiple Choice Answer as you go along Green screens are important pause and re-read #5 is c: modem port can be internal and external Go to Chapter 2 5E edition/Companion Web Site On-line Study Guide results to me at and to yourself to 46 Software: Programs that enable hardware to perform different tasks Application software System software 47 1. System Software Operating System: provides the instructions that the computer needs to run 2. Application Software consists of programs that tell a computer how to produce information or accomplish a task 4-208/212/213 Whats on the front of your system unit? 49 Whats on the back of your system unit? 50 Whats inside your system unit? 51 How do you set up your computer to avoid strain and injury? 52 Objectives - Chapter 2 After reading this chapter, you should be able to answer the following questions: 1. What exactly is a computer, and what are its four main functions? (p. 50) 2. What is the difference between data and information? (p. 50) 3. What are bits and bytes, and how are they measured? (p. 50) 4. What devices do you use to get data into the computer? (p. 52)