Technology In ActionChapter 2 Looking at Computers: Understanding the PartsTopicsHardwareInput DevicesKeyboardDvorak KeyboardSlide 8MouseSlide 10Inputting SoundOutput DevicesMonitor TypesCRT MonitorsLiquid Crystal DisplayPrintersNon-impact PrintersOutputting SoundThe System UnitThe Front PanelSlide 21Inside the System UnitThe MotherboardSlide 26Slide 27Setting it all up: ErgonomicsChapter 2 Summary QuestionsSlide 30Slide 31Slide 32Slide 33Slide 34© 2007 Prentice-Hall, Inc. 1Technology In ActionTechnology In Action© 2007 Prentice-Hall, Inc. 2Chapter 2Chapter 2Looking at Computers: Looking at Computers: Understanding the PartsUnderstanding the Parts© 2007 Prentice-Hall, Inc. 3TopicsTopics•Hardware componentsHardware components•Input devicesInput devices•Output devicesOutput devices•System unitSystem unit•ErgonomicsErgonomics© 2007 Prentice-Hall, Inc. 4HardwareHardware•System UnitSystem Unit•Peripheral DevicesPeripheral DevicesSystem UnitSystem UnitPeripheral DevicesPeripheral Devices© 2007 Prentice-Hall, Inc. 5Input DevicesInput Devices•Devices used to enter information or Devices used to enter information or instructions into the computerinstructions into the computer–KeyboardKeyboard–Mouse / pointing deviceMouse / pointing device–Microphone Microphone –ScannerScanner–Digital cameraDigital camera© 2007 Prentice-Hall, Inc. 6KeyboardKeyboard•The QWERTY keyboard with enhanced The QWERTY keyboard with enhanced features is standard with most modern features is standard with most modern personal computerspersonal computers© 2007 Prentice-Hall, Inc. 7Dvorak KeyboardDvorak Keyboard•Puts the most commonly used keys at “home keys”Puts the most commonly used keys at “home keys”•Reduces distance of finger stretchesReduces distance of finger stretches© 2007 Prentice-Hall, Inc. 8Specialty KeyboardsSpecialty Keyboards•LaptopsLaptops•PDAsPDAs•WirelessWireless•ErgonomicErgonomicLaptop Ergonomic PDA© 2007 Prentice-Hall, Inc. 9MouseMouse•Roller ball mouse Roller ball mouse –Less expensiveLess expensive–Harder to keep cleanHarder to keep clean•TrackballTrackball–Harder to controlHarder to control–Stationary on deskStationary on desk•Optical mouseOptical mouse–Needs no mouse padNeeds no mouse pad–Doesn’t need cleaningDoesn’t need cleaning–More expensiveMore expensiveWireless Optical Trackball Standard© 2007 Prentice-Hall, Inc. 10Other Input DevicesOther Input Devices•ScannersScanners–TextText–Images Images •Digital camerasDigital cameras–Images Images –Video Video Flatbed Handheld Camera Camcorder© 2007 Prentice-Hall, Inc. 11Inputting SoundInputting Sound•Microphone InputMicrophone Input–TeleconferencingTeleconferencing–Voice over InternetVoice over Internet–Voice Recognition Voice Recognition Microsoft Voice Recognition© 2007 Prentice-Hall, Inc. 12Output DevicesOutput Devices•Retrieving information Retrieving information from the computerfrom the computer•Output devices Output devices –Softcopy (video, Softcopy (video, sounds, control sounds, control signals)signals)–Hardcopy (print)Hardcopy (print)© 2007 Prentice-Hall, Inc. 13Monitor TypesMonitor Types•CRT CRT Cathode Ray TubeCathode Ray Tube–Less ExpensiveLess Expensive–Use much more spaceUse much more space–Uses more energyUses more energy–Better viewing anglesBetter viewing angles•LCD LCD Liquid Crystal DisplayLiquid Crystal Display–More expensiveMore expensive–Uses far less spaceUses far less space–More energy efficientMore energy efficient–Less viewable from an angleLess viewable from an angle© 2007 Prentice-Hall, Inc. 14CRT MonitorsCRT Monitors•Uses picture tube technologyUses picture tube technology•Screen size – Diagonal Screen size – Diagonal measurement of the screen (15, 17, measurement of the screen (15, 17, 19, 21)19, 21)•Resolution – Sharpness of the Resolution – Sharpness of the image determined by the number image determined by the number pixels that the screen can display pixels that the screen can display (800 x 600, 1024 x 768, 1600 x (800 x 600, 1024 x 768, 1600 x 1200)1200)•Refresh rate – Speed at which the Refresh rate – Speed at which the screen is refreshed (60Hz, 75Hz) screen is refreshed (60Hz, 75Hz) Faster rate equals less flicker.Faster rate equals less flicker.© 2007 Prentice-Hall, Inc. 15Liquid Crystal DisplayLiquid Crystal Display•Liquid crystal sandwiched between two Liquid crystal sandwiched between two transparent layers form imagestransparent layers form images•Used for notebook computers, PDAs, cellular Used for notebook computers, PDAs, cellular phones, and personal computersphones, and personal computersPolarizer Color filter Color filter glassGlass polarizerBacklight Liquid Crystal© 2007 Prentice-Hall, Inc. 16Dot-matrixPrinters Printers Inkjet Multifunction Laser Plotter Thermal printer•Impact printersImpact printers–Dot-matrixDot-matrix•Non-impact Non-impact printersprinters–InkjetInkjet–Laser Laser –MultifunctionMultifunction•Specialty printersSpecialty printers–PlottersPlotters–Thermal printersThermal printers© 2007 Prentice-Hall, Inc. 17Non-impact PrintersNon-impact Printers•Ink JetInk Jet–Less expensive deviceLess expensive device–Full color printingFull color printing–Slower in pages per Slower in pages per minute (PPM)minute (PPM)–More expensive per More expensive per page in B&Wpage in B&W•LaserLaser–More expensive deviceMore expensive device–Black and White (Color Black and White (Color lasers are very lasers are very expensive)expensive)–Faster in PPMFaster in PPM–Less expensive in B&WLess expensive in B&W© 2007 Prentice-Hall, Inc. 18Outputting SoundOutputting Sound•Speakers and Speakers and HeadphonesHeadphones© 2007 Prentice-Hall, Inc. 19The System UnitThe System UnitBox that contains the central electronic components of the computer::–CPU/RAM/CPU/RAM/motherboardmotherboard–Expansion cardsExpansion cards–Power supplyPower supply–Storage devicesStorage devices© 2007 Prentice-Hall, Inc. 20The Front PanelThe Front Panel•Drive BaysDrive Bays•Memory card Memory card readerreader•Floppy DriveFloppy Drive•Productivity Productivity PortsPorts•Power ButtonPower Button© 2007 Prentice-Hall, Inc. 21The BackThe Back•Ports for peripheral devicesPorts for peripheral devices•Types of ports:Types of ports:–SerialSerial–ParallelParallel–VGAVGA–USBUSB–ConnectivityConnectivity©