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					Unit 1—Computer Basics


  Lesson 5
  Input, Output, and Storage
Objectives

  Identify and describe the most common
   input devices.
  Identify and describe the most common
   output devices.
  Identify and describe storage devices.
  Identify and describe how input and output
   devices are connected to the computer.


                                 Computer Concepts BASICS - 2
Input and Output Devices

    Input devices enable a user to input data
     and commands to the computer to be
     processed.
    Output devices enable the computer to give
     or show you the results of its processing.
    Some devices can perform both input and
     output operations.



                                  Computer Concepts BASICS - 3
Input Devices—The Keyboard

    The keyboard is the most widely used input
     device.
        As you press keys on the keyboard, an
         electrical signal representing that key is sent to
         the computer.
        Keyboards are divided into sections.




                                           Computer Concepts BASICS - 4
Input Devices—The Keyboard (cont.)

  Typewriter keys: The standard alphabetic
   and numeric characters you would find on a
   typewriter
  Function keys: Special keys that perform
   some specific function for the application being
   run
  Numeric keypad: Used for mathematical
   operations
  Directional keys: Used to move the cursor
   around the screen
                                    Computer Concepts BASICS - 5
Input Devices—The Mouse

    The mouse is a pointing device that rolls
     around on a flat surface and controls the
     location of the pointer on the screen.
    The mouse performs the following functions:
        Pointing: Placing the on-screen pointer at a
         specific place
        Clicking: Pressing and releasing the
         mouse button



                                        Computer Concepts BASICS - 6
Input Devices—The Mouse (cont.)

    Mouse functions (cont.)
        Dragging: Holding down the mouse button
         and dragging an object to a new location by
         dragging the mouse
        Double-clicking: Pressing and releasing the
         mouse button twice very quickly
        Right-clicking: Pressing the right
         mouse button



                                       Computer Concepts BASICS - 7
Other Pointing Devices

    Other devices that control the on-screen
     pointer:
        Trackball: This is like a mouse turned upside
         down. You roll a ball around with your fingers
         to control the location of the pointer.
             These frequently are found on notebook
              computers.




                                            Computer Concepts BASICS - 8
Other Pointing Devices (cont.)

       Joystick and wheel: Joysticks consist of a
        metal or plastic handle mounted on a base
        that you can move in any direction to move
        the pointer or other object.
          These typically are used for video games.
          Most have buttons that can be pushed
           or clicked to control input/output.




                                         Computer Concepts BASICS - 9
Other Input Devices

    Pointing stick: A pressure-sensitive
     device that resembles a pencil eraser;
     found mostly on notebook computers
    Graphics tablet: A flat drawing surface
     connected to the computer
        The user draws on the surface, and the
         figures or writing on the tablet can be input to
         the computer for processing.



                                          Computer Concepts BASICS -10
Other Input Devices (cont.)

    Touch display: Screens that contain
     pictures or shapes that the user can press
     to input that data
    Stylus/digital pen: Used with mobile
     devices to input data
    Touchpad: Used mostly in laptop/notebook
     computers



                                  Computer Concepts BASICS -11
Other Input Devices (cont.)

     Audio/voice input: Inputting sound and/or
      voice
         These usually require a microphone and
          special voice recognition software to be
          installed on the computer.




                                        Computer Concepts BASICS -12
Other Input Devices (cont.)

    Scanners: Devices that can convert a
     graphical image into a digital image and
     input it to the computer
        Types of scanners include
           Image scanners for scanning images and text
           Bar code scanners to read product bar codes

           Magnetic scanners to read the magnetic strip
            on a credit card



                                          Computer Concepts BASICS -13
Other Input Devices (cont.)

    Digital cameras: Used to take pictures and
     store them on a magnetic disk instead of on
     film
        Their images can be input directly into the
         computer.
    Video input: Input from a camcorder or
     VCR using video capture cards



                                         Computer Concepts BASICS -14
Other Input Devices (cont.)

    Biometric input: Uses fingerprint, face,
     handwriting, and voice for identification




                                    Computer Concepts BASICS -15
Magnetic Storage Devices

  Floppy disks: Small, portable disks that hold
   a limited amount of data
  Hard disks: Large-capacity and fast-access
   storage devices
  Zip disks: Auxiliary storage devices that can
   hold large quantities of data and can be
   portable
  Magnetic tape drives: Used for making
   system backups and storing large quantities of
   data

                                   Computer Concepts BASICS -16
Optical Storage Devices

  CD-DA: Audio CD
  CD-R: This drive allows you to read and to
   write to a compact disk
  CD-ROM: Can hold large amounts of data,
   but is read-only access




                                 Computer Concepts BASICS -17
Optical Storage Devices (cont.)

  CD-RW: Can be written on several times
  DVD-ROM: Read-only DVD format
  DVD-R: Similar to CD, but holds more data;
   read-only
  DVD-RW: Can be written on several times
  PhotoCD: Used for storing digital
   photographs on a CD


                                Computer Concepts BASICS -18
Solid-State Storage Media

  Non-volatile removable media
  Miniature mobile media
        Uses integrated circuits
        Also known as Memory Cards
    USB flash drive
        Connects to the computer via a USB port




                                      Computer Concepts BASICS -19
Caring for Storage Media

    To safeguard your data from damage,
     follow these tips when dealing with
     removable media:
        Keep away from magnetic fields.
        Avoid extreme temperatures.
        Never try to disassemble the case.
        Remove media from drive when not being
         used.



                                      Computer Concepts BASICS -20
Caring for Storage Media (cont.)

    Tips for dealing with storage media (cont.)
        Write-protect important data.
        Hold optical disks at their edges.
        Never remove the media from the drive if the
         access light is on.
        Keep disks in a sturdy case when transporting
         them.




                                       Computer Concepts BASICS -21
Output Devices—Monitors

    Monitors are used to display video output
     to a user.
    Monitors may be monochromatic or color.
        Monochromatic monitors display output in a
         single-color display.




                                       Computer Concepts BASICS -22
Output Devices—Monitors (cont.)

    Factors that influence the quality of a
     monitor
        Screen size: The diagonal measurement in
         inches of the display area
        Resolution: The number of pixels that can be
         displayed in the display area
        Dot pitch: The distance between each pixel in
         the display area



                                        Computer Concepts BASICS -23
Typical Computer Monitor

  This figure shows a typical
  computer monitor on a swivel
  stand that can be adjusted for
  viewing comfort.


                             LCD




                                   Gas
                                   plasma



                                            Computer Concepts BASICS -24
Output Devices—Printers

    Printers are used to create a hard copy of
     a document or image.
        Printers vary by speed, quality, and price.




                                         Computer Concepts BASICS -25
Output Devices—Printers (cont.)

    The most popular types of printers are
      Laser: Produce images using the same
         techniques as copier machines
        Ink jet: Use fine nozzles to spray ink onto
         the page as the paper passes through
        Dot matrix: Work similarly to a typewriter in
         that ink is transferred to the paper by some
         part of the printer striking a ribbon to transfer
         an image

                                           Computer Concepts BASICS -26
Laser Printer

  This figure provides an
  overview of a laser printer.




                                 Computer Concepts BASICS -27
   Ink Jet Printer


This figure provides an
overview of an ink jet printer.




                                  Computer Concepts BASICS -28
Other Types of Output Devices

  Speakers and headsets
  Fax machines and fax modems
  Multifunctional devices
        Contain a variation of output options
    Data projectors




                                         Computer Concepts BASICS -29
Connecting I/O Devices to the
Computer
    Input and output devices must be connected
     to the computer before they can be used.
    Connecting I/O devices to the computer:
        Plug the device into an existing socket or port
         on the back of the computer.
        Install an expansion card with the port you
         need included on the back of the card.
        Connect wirelessly.


                                          Computer Concepts BASICS -30
Summary

  Input devices enable you to input data and
   commands into the computer.
  The most common input devices are the
   keyboard and mouse.
  Other types of input devices include trackball,
   joystick and wheel, pointing stick, graphics
   tablet, touch display screen, stylus, voice
   recognition devices, touchpad, scanner, digital
   camera, video input, and biometric input.

                                    Computer Concepts BASICS -31
Summary (cont.)

    To maintain a permanent copy of data, you
     should store it on some type of storage
     medium.
    The three categories of storage media are
     magnetic storage, optical storage, and
     solid-state storage.
    Monitors and printers are examples of
     output devices.


                                  Computer Concepts BASICS -32
Summary (cont.)

  Monitors produce soft copy.
  Printers are used to produce a paper or
   hard copy of the processed result.
  Criteria for selecting a printer include
   speed, print quality, and cost.
  Input and output devices must be physically
   connected to the computer.



                                 Computer Concepts BASICS -33
Summary (cont.)

    Some input devices communicate with
     the computer through a physical
     connection.
    Wireless devices communicate with the
     computer through infrared or radio waves.




                                   Computer Concepts BASICS -34

				
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