tle 2

• Output hardware


  Internal and external devices that transfer information from the computer's CPU to the computer user
• Common output hardware

  • Monitor
  • Printer
  • Speaker
• Monitor


  The visual component of your computer; it is how you interact with your computer by seeing a visual representation of what you are doing
• Display screen


  Used to present output from a computer, video camera, VCR or other video generator
• Pixels


  • Dots that make up the image on your screen
  • Resolution: the number of pixels displayed on the screen (the higher the resolution, the closer together the dots)
  • Screen size: measured as a diagonal line across the screen – from corner to opposite corner
• Printer


  Used to make a paper copy of the information from the computer
• Types of printer


  • Dot-matrix printer
  • Ink-jet printer
  • Thermal printer
  • Plotter printer
• Ink-jet printer


  • Makes images by forcing droplets through nozzles
  • Top speed is 20 pages per minute
• Laser printer


  • Forms images using an electrostatic process
  • Prints between 3 and 30 pages per minute
• Plotter printer


  Used to print tarpaulins
• Thermal printer


  It applies heat to print
• Types of microphones


  • Desktop microphones
  • Headsets
  • Earphones
• Speakers or headphones


  Used to hear the audio produced by the computer
• Connecting devices


  Allow hardware devices to communicate with each other
• Modem


  Connects a personal or portable computer to dial-up networks through a regular telephone line
• LAN card


  Used to provide wireless Internet access to computer users in home or roaming networks
• Hard drive


  A device that is used for storing data. A hard drive stores programs and data that are not currently being used by the CPU
• Optical drive


  Where a Compact Disk that can be read by a computer
• Sizes of storage devices

  • Kilobytes
  • Megabytes
  • Gigabytes
• USB (Universal Serial Bus)


  A universal connector to enable many different devices to connect to your computer
• USB flash drive


  A type of USB device
• Software


  Anything you can't touch. The instructions for the hardware
• Types of computer software

  • System software
  • Application software
  • Utility software
• System software


  Helps in running the computer hardware and the computer system
• Operating system


  An interface between hardware and user; it is responsible for the management and coordination of activities and the sharing of the limited resources of the computer
• Types of application software


  • Web browsing software
  • Word processing software
  • Spreadsheet software
  • Presentation graphics software
• Utility software


  Helps in the management of computer hardware and application software. It performs a small range of tasks
• Examples of utility software


  • Backup
  • Anti-virus
• backup

  This utility make a copy of all information stored on a disk, and restore either the entire disk or selected files.
• anti-virus

  These utilities scan computer for viruses.