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Concepts 7 Unit B Ppt Concepts 7 Unit B Ppt Presentation Transcript

  • Computer Concepts - Illustrated Introductory, Seventh Edition UNIT B: Computer Hardware
  • Objectives
    • Examine input devices
    • Review display devices
    • Compare printers
    • Introduce storage technology
    • Compare storage technologies
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Objectives
    • Explore hard drive technology
    • Examine CDs and DVDs
    • Review solid-state storage
    • Expand your computer
    • Talking Points: Why recycle computers?
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Input devices - input information for computer to process
    • Typical input devices
      • Keyboard and pointing device (mouse)
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Keyboards
      • Most have a similar structure
      • Can be found on PCs, handheld devices
    • Keyboard includes keys or buttons with letters, numbers, and special words and characters
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Desktop and notebook computer keyboards include Navigation keypad
      • Home, End, arrow keys
      • Used to move screen-based insertion point (cursor)
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Mouse
      • Pointing device which manipulates an on-screen pointer and other on-screen controls
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Mouse options -
      • Mechanical mouse
        • Position based on movement of ball that rolls on pad
      • Optical mouse
        • Uses LED light and computer chip
      • Laser mouse
        • Uses laser as light source to track movement
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Mouse dots per inch (dpi)
      • Higher dpi more sensitive and accurate
    • Mouse transmits signals one of two ways
      • Wired or Wireless
    • Most prefer optical or laser
      • Durability
      • Less maintenance
      • Can be used on variety of surfaces
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Other pointing devices
      • Pointing stick or TrackPoint
      • Touchpad or trackpad
      • Trackball
      • Joystick
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining Input Devices
    • Other input devices
      • Touch screen technology
      • Scanner
      • Microphone
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Computer display system
      • Main output device
    • Two key components
      • Graphics card
      • Display device such as monitor or screen
    • Use one of three technologies
      • CRT, LCD, plasma
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • CRT Monitor(cathode ray tube)
      • used to be standard
      • Big and bulky
      • Not typically sold with new computers today
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • LCD (liquid crystal display)
      • Produces image by manipulating light within layer of crystal cells
    • Advantages include
      • Display clarity
      • Low radiation emission
      • Portability and compactness
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Plasma
      • Creates on-screen image by illuminating miniature colored fluorescent lights arrayed in panel-like screen
      • More expensive than LCD
      • Used more for large screen venues
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Graphics cards
      • Contain graphics processing units (GPU)
        • Circuitry generates signals for displaying image on screen
      • Amount of available video memory
        • Key to how fast screen updates when information is displayed
      • Typically built into motherboard
      • Sometimes available as small circuit board that plugs into motherboard
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Graphics card - key to how images display on monitor
      • Resolution
        • Maximum number of horizontal and vertical pixels displayed on screen
      • Pixel (picture element)
        • single point or smallest unit in image
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices Comparing Screen Resolution Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Screen size
      • Measurement in inches from one corner of screen diagonally to opposite corner
      • Typical monitor sizes
        • 13” to 21”
        • Larger screens exist
    • Viewing angle width
      • How far to side you can clearly see screen image
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Dot pitch (dp)
      • Measure of image clarity
      • Smaller dp means crisper image
    • Dot pitch - distance in millimeters between like-colored pixels
      • Ranges from .26 mm to .23 mm
      • Not customizable
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Display Devices
    • Color depth or bit depth
      • Number of colors monitor and graphics card can display
      • Most PCs can display millions of colors
    • Monitors can be used to watch television
      • if proper circuitry is installed
      • NTSC or HDTV circuitry
        • Allows PC to accept signals from antenna or cable
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Printers
      • Produce hard copy of computer-generated text or graphical images
        • Paper, labels, transparencies
      • Differ in resolution and speed
      • Most printers use ink-jet or laser technologies
    • Specialized applications
      • Impact, solid ink, thermal transfer, dye sublimation
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Ink-jet printers
      • Sprays ink onto paper to form characters and graphics
      • Two ink cartridges: Black and color
      • Small, lightweight, inexpensive
      • Cartridges can be expensive and add to printing costs
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Laser printer
      • Produces dots of light on light sensitive drum to produce characters and graphics
      • Good high-volume, good quality printing
      • More expensive than ink-jet
      • Color laser printers more expensive than black-and-white
      • Toner cartridges are expensive, produce more pages than ink-jet cartridges
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Photo printers
      • Use thermal dye
      • Slower output speeds than other printers
      • Produce professional-quality images on specialized papers
      • Cost of replacement cartridges should be considered
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Printer resolution
      • Density of grid of dots that create image
      • Measured in dpi (dots per inch)
        • At reading distance, 900 dpi looks solid
        • Good-quality printers are rated 2400 to 4800 dpi
        • Magazine quality printouts are about 900 dpi
        • Expensive coffee-table books are comparable to 2400 dpi or higher
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Pages per minute (ppm)
        • Measurement of printer speed
        • Color usually takes longer to print than black-and-white
        • Text prints faster than heavy graphics
        • Most printers for personal or small business print 15 to 30 ppm
    • Memory capacity
        • More memory needed to print color and graphics
        • Laser printers: Between 64 MB and 120 MB
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Duplex printer
      • Can print both sides of paper
    • Duty cycle
      • Proportion of time during which device is operated
      • Usually measured in pages per month
      • Higher duty cycle means shorter useful life
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Printers
    • Computer connected to network can share printer with other computers on network
    • Network-enabled printer
      • Connects directly to network, not single computer
      • Network connection can be wired or wireless
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Storage technology
      • Data storage systems that allow electronic devices to store and retrieve data
      • Data storage consists of storage medium and storage device
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Storage medium
      • Hard drive, tape, memory card, CD, DVD or other technology that holds data
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Storage device
      • Equipment that stores and retrieves data from storage medium
      • Hard drives, card readers, tape drives, CD and DVD drives, flash drives, solid-state drives, Zip drives
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Hard drive
      • Computers come with internal hard drive
      • Can’t be moved from one computer to another
      • Provide fast data access
    • Some storage devices are more dependable than others
      • CDs, DVDs
    • Flash drives and external hard drives
      • Can be moved from computer to computer
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • RAM (random access memory)
      • Temporary holding area for your work and programs needed to produce your work
      • RAM - emptied when computer shuts off
      • Data easily lost
        • Store data on storage medium, not as likely to lose work
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Drive bays
      • Storage “parking spaces”
        • In system unit case
        • Used to connect storage devices to computer
      • Internal or external
    • When buying computer, find out:
      • How many drive bays it has
      • What storage devices can be connected
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Introducing Storage Technology
    • Drive bays
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Random vs. sequential access
      • Random (direct) access
        • Ability to jump directly to requested data
        • Hard drive, solid-state drive, CD and DVD drives
      • Sequential access
        • Must read through data from beginning to end
        • Tape drive
        • Slower
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Access time
      • Average time it takes computer to locate and read data
      • Measured in milliseconds
    • Data transfer rate
      • Amount of data that can be moved from storage medium to computer per second
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Storage capacity
      • Maximum amount of data that can be stored on storage medium
        • Measured in kilobytes (KB), megabytes (MB), gigabytes (GB), or terabytes (TB)
      • Graphics need more storage capacity than text
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Magnetic storage
      • Magnetizes microscopic particles on disk or tape surface
      • Particle patterns are interpreted as 0s and 1s
      • Provides flexibility for editing data and reusing storage medium
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Magnetic media
      • No very durable
      • Eventually loses magnetic field
      • Damaged by magnetic fields, dust, mold, smoke, heat, mechanical problems
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Optical storage
      • Stores data as light and dark spots on surface of disk
      • Light patterns are interpreted as 1s and 0s
      • Advantages:
        • Portable
        • Quite versatile
        • Less susceptible to environmental damage
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Solid-state storage
      • Stores data in nonvolatile, erasable, low-power chip
      • Drive has no moving parts
      • Very durable, portable, versatile
      • Capacity does not currently match that of hard drives
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Comparing Storage Technologies
    • Why Versatility?
      • Important working with other people and other computers
      • Store data and share with others using same storage medium
    • Why Durability?
      • Determines ability of device or media to last so data remains accessible
      • Important for traveling and carrying files
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Exploring Hard Drive Technology
    • Hard drives preferred type of main storage
      • Three main reasons
        • Storage capacity
        • Fast access
        • Economical
          • 40 MG of storage costs about a penny
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Exploring Hard Drive Technology
    • Parts of hard drive
      • One or more platters on spindle with associated read-write heads
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Exploring Hard Drive Technology
    • Hard drives found in wide variety of digital devices
    • Physical size of hard drive varies depending on size of device
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Exploring Hard Drive Technology
    • Factors that determine how fast data can be made available
      • Access time (measures in milliseconds)
      • Rotation speed (measured in revolutions per minute)
    • Hard drive platters with data are divided into tracks and sectors
      • Cylinder
        • Vertical stack of tracks
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Exploring Hard Drive Technology
    • Controller
      • Circuit board that positions disk, locates data, and interfaces with components on system board
    Computer Concepts – Illustrated Introductory, Seventh Edition Hard drive showing Controller card
  • Exploring Hard Drive Technology
    • Adding second hard drive increases storage, provides backup
      • Data available on only one drive at a time
    • Hard drives
      • Not as durable as many other storage technologies
      • Head crash can be caused by particles as small as piece of dust
      • Handle and transport with care
      • Always have backup copies of hard drive
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • CDs and DVDs can be used to store data
      • CD (compact disc)
      • DVD (digital video disc or digital versatile disc)
    • Three optical digital technologies
      • Read-only (ROM)
      • Recordable
      • Rewritable
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • CD-ROM
      • Read-only technology
    • CD-R
      • Recordable technology
    • CD-RW
      • Rewritable technology
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • DVD-R and DVD+R
      • Recordable DVD formats
    • DVD-RW and DVD+RW
      • Rewritable formats
    • Why so many?
      • One standard has not emerged as industry leader
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • Computer CD-ROM or DVD-ROM
      • Discs cannot have data added, erased, or changed
    • To record data one or more times
      • Need recordable media (one time use)
      • Rewritable (multiple session use) discs
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • Good idea to have CD or DVD drive
      • Create music CDs or DVDs
      • CD drives can’t read DVDs
      • Most DVDs can read DVDs or CDs
    • Several types of CD and DVD drives
      • Can be used for different purposes
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs Computer Concepts – Illustrated Introductory, Seventh Edition CD or DVD Drive Capabilities
  • Examining CDs and DVDs
    • Rewritable CD and DVD drives
      • Not acceptable replacement for hard drive
      • Saving, accessing, modifying data is much slower
      • Capacity is inadequate when compared to hard drives
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • CD and DVD drives use laser technology to read data
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • Make your own CDs
      • Need proper hardware, media
    • CD-R or DVD-R
      • Must put all data on disc in one session
    • Rewritable technology
      • Can record in multiple sessions
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Examining CDs and DVDs
    • Handling CDs and DVDs
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • Solid-state storage
      • Portable and durable
      • Provides fast data access
      • Uses very little power
      • Used in consumer devices
        • Digital cameras, MP3 players, notebooks, PDAs, cell phones
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • Solid-state storage suitable for many needs
      • Can hold hundreds of photos
      • Store MP3 files
      • Portable computing
    • Data can be erased so card can be reused
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • How does it work?
      • Nonvolatile, erasable, low-power chip stores data
      • Circuitry arranged in grid
        • Each cell holding transistors that act as gates
        • Open gates represent 1, closed represents 0
    • Chip retains data without external power
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • Several types of solid-state memory cards
      • CompactFlash cards (CF)
      • MultiMedia cards (MMC)
      • SecureDigital cards (SD)
      • SmartMedia cards
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • Card reader
      • Transfers data to and from computer
      • Can stand alone, or be part of system unit
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Reviewing Solid-State Storage
    • USB flash drive
      • Portable storage device with built-in connector that plugs into USB port
      • Small and durable
      • Can be carried on key ring
    • U3 drive or U3 smart drive
      • Special USB flash drive preconfigured to play automatically when connected to computer
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Expanding
      • Increase / improve capabilities of computer
      • Add peripherals
        • Scanners, mouse, cameras, graphics tablets, etc.
      • Add or upgrade sound cards, video cards, etc.
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Most peripherals can be added using external USB port
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Expansion cards can be added / upgraded to enhance functionality
      • Graphics card
      • Modem card
      • Sound card
      • Network card
    • Also called expansion boards, controller cards, or adapters
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • An expansion card
      • Small circuit board that provides computer ability to control input, storage, or output devices
    • Data bus
      • Circuits over which data travels from one component to another
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Expansion bus
      • Segment of data bus between RAM and peripheral devices
      • Allows data to travel through expansion slots, cards, ports, and cables
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Expansion slot
      • Long, narrow socket on motherboard into which expansion card is plugged
    • PCMCIA slot
      • External expansion slot for PC
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Expansion ports
      • Connectors that pass data in and out of computer or peripheral device
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Expanding Your Computer
    • Device driver
      • Software that sets up communication between computer and device or card
      • Each device or card needs one
      • Directions supplied with device or card includes instructions for installing device driver
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Talking Points: Why recycle computers?
    • 500 million computers were obsolete by 2007
    • About 1 billion floppy discs, CDs, and DVDs end up in landfills every year
    • Computer parts contain toxins like lead, phosphorous, and mercury
      • Monitors can contain up to six pounds of lead
    Computer Concepts – Illustrated Introductory, Seventh Edition
  • Talking Points: Why recycle computers?
    • Instead of throwing away
      • Sell it
      • Donate it to school, church, or community program
      • Have it hauled away by professional recycling firm
      • Send it back to manufacturer
    Computer Concepts – Illustrated Introductory, Seventh Edition