Technology In Action Prentice-Hall, Inc. 1
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1 Technology In Action 2008 Prentice-Hall, Inc. 1
2 Technology In Action Chapter 2 Looking at Computers: Understanding the Parts 2008 Prentice-Hall, Inc. 2
3 Chapter Topics Hardware components Input devices Output devices System unit Ergonomics 2008 Prentice-Hall, Inc. 3
4 Hardware System Unit Peripheral Devices System Unit Peripheral Devices 2008 Prentice-Hall, Inc. 4
5 Input Devices Devices used to enter information or instructions into the computer Keyboard Mouse / pointing device Microphone Scanner Digital camera Scanner 2008 Prentice-Hall, Inc. 5
6 Keyboard The QWERTY keyboard is standard on most PCs Enhanced features include number, function and navigation keys Prentice-Hall, Inc. 6
7 Dvorak Keyboard Puts the most commonly used keys at home keys Reduces distance of finger stretches 2008 Prentice-Hall, Inc. 7
8 Specialty Keyboards Laptops PDAs Wireless Ergonomic Gaming Laptop PDA Ergonomic 2008 Prentice-Hall, Inc. 8
9 Mouse Rollerball mouse Less expensive Harder to keep clean Trackball Harder to control Stationary on desk Optical mouse Needs no mouse pad Doesn t need cleaning More expensive Game pads Buttons and pointing devices Standard Trackball Wireless Optical 2008 Prentice-Hall, Inc. 9
10 Other Input Devices Scanners Text Images Digital cameras Images Video Flatbed Handheld Camera Camcorder 2008 Prentice-Hall, Inc. 10
11 Input for the Physically Challenged Visually Impaired Voice recognition Keyboards with large keys On-screen keyboards Motor control Special trackballs Head-mounted devices 2008 Prentice-Hall, Inc. 11
12 Inputting Sound Microphone Input Teleconferencing Voice over Internet Voice Recognition Microsoft Voice Recognition 2008 Prentice-Hall, Inc. 12
13 Output Devices Retrieving information from the computer Output devices Softcopy (video, sounds, control signals) Hardcopy (print) 2008 Prentice-Hall, Inc. 13
14 Monitor Types CRT Cathode Ray Tube Less expensive Use much more space Uses more energy Better viewing angles LCD Liquid Crystal Display More expensive Uses far less space More energy efficient Less viewable from an angle 2008 Prentice-Hall, Inc. 14
15 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) Faster rate equals less flicker Prentice-Hall, Inc. 15
16 Liquid Crystal Display Liquid crystal sandwiched between two transparent layers form images Used for notebook computers, PDAs, cellular phones, and personal computers Liquid Crystal Polarizer Color filter Color filter glass Glass polarizer Backlight 2008 Prentice-Hall, Inc. 16
17 Other Video Output Touch-screen monitors double as both input and output devices. Data projectors project a computer image to a large screen for sharing with large groups Prentice-Hall, Inc. 17
18 Printers Impact printers Dot-matrix Nonimpact printers Inkjet Laser Multifunction Specialty printers Plotters Thermal printers Dot-matrix Laser Plotter Inkjet Multifunction Thermal printer 2008 Prentice-Hall, Inc. 18
19 Nonimpact Printers Inkjet Less expensive device Full color printing Slower in pages per minute (PPM) More expensive per page in B&W Laser More expensive device Black and White (Color lasers are very expensive) Faster in PPM Less expensive in B&W 2008 Prentice-Hall, Inc. 19
20 Outputting Sound Speakers and Headphones 2008 Prentice-Hall, Inc. 20
21 The System Unit Box that contains the central electronic components of the computer: CPU/RAM/ motherboard Expansion cards Power supply Storage devices 2008 Prentice-Hall, Inc. 21
22 The Front Panel Drive bays Memory card reader Floppy drive Productivity ports Power button 2008 Prentice-Hall, Inc. 22
23 The Back Ports for peripheral devices Types of ports: Serial Parallel VGA USB Connectivity 2008 Prentice-Hall, Inc. 23
24 Inside the System Unit Essential electronic components used to process data Types of components: Power supply Hard disk drive Motherboard CPU Expansion cards 2008 Prentice-Hall, Inc. 24
25 The Motherboard CPU RAM Expansion cards Chip set Built-in components 2008 Prentice-Hall, Inc. 25
26 Expansion Cards Adds functions Provides new connections for peripheral devices Common types: Sound Modem Video (VGA) Network (NIC) 2008 Prentice-Hall, Inc. 28
27 Hard Disk Drive Stores data and program instructions Permanent (nonvolatile) storage Storage capacities up to 250 GB and higher Transfers data in milliseconds 2008 Prentice-Hall, Inc. 29
28 Setting it all up: Ergonomics Ergonomics refers to minimizing injury or discomfort while using the computer Steps to follow: Position monitor correctly Use adjustable chair Assume proper position while typing Take breaks Ensure adequate lighting 2008 Prentice-Hall, Inc. 30
29 Chapter 2 Summary Questions What devices do you use to get data into the computer? 2008 Prentice-Hall, Inc. 31
30 Chapter 2 Summary Questions What devices enable us to see or hear the processed information? 2008 Prentice-Hall, Inc. 32
31 Chapter 2 Summary Questions What s on the front of your system unit? 2008 Prentice-Hall, Inc. 33
32 Chapter 2 Summary Questions What s on the back of your system unit? 2008 Prentice-Hall, Inc. 34
33 Chapter 2 Summary Questions What s inside your system unit? 2008 Prentice-Hall, Inc. 35
34 Chapter 2 Summary Questions How do you set up your computer to avoid strain and injury? 2008 Prentice-Hall, Inc. 36
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