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Monday, May 9, 2011

Output Device of Computer


         What is output?
          Data that has been processed into a useful form called information

         What is is an output device ?
                      Any hardware component that can convey information to use

         What is a Display device?
          Output device that visually conveys information.Information on display device sometimes called softcopy. mnitor houses display device as separate peripheral

   

  
  
          What is a CRT monitor ?
          Contains Cathode-Ray Tube (CRT)
          Large sealed, glass screen
          Screen coated with tiny dots of phosphor material
          Pixel or picture element is single point in electronic image
          Three dots (red, blue and green) combine to make a pixel
          Common sizes are 15, 17, 19, 21 and 22 inches
          Viewable size is diagonal measurement of actual viewing area provided by the monitor

          What is Resolution?
          Describes the sharpness and clarity of image
          Higher resolution makes image sharper, displays more text on screen, makes some elements smaller
          Refresh rate is speed at which monitor redraws images on screen

          What is Dot pitch?
          Measure of the distance between pixels
          Sometimes called pixel pitch
          Smaller the distance between the pixels, the sharper the image

          What is Refresh Rate ?
          Speed at which monitor redraws images on the screen


          What is a video card?
          Converts digital output from computer into analogue video signal
          Controls how display device produces picture
          Also called graphics card or video adapter


         What is Bit depth?
          Number of bits a video card uses to store information about each pixel
          Also called colour depth
          Determines number of colours a video card can display Greater the number of
           bits, better the resulting image

                     
               What are Video standards ?
          Video Electronics Standards Association (VESA) develops video standards

          What are various video card configurations ?


          What is Electromagnetic radiation (EMR) ?
          Magnetic field that travels at speed of light
          Small amount produced by all CRT monitors
          LCD monitors do not pose this risk

          What is a Liquid crystal display (LCD) monitor?
          Uses liquid crystals between two sheets of material to present information on 
           screen
          Electric current passes through crystals, which creates images on the screen
          Takes up less desk space than CRT monitor
          Consumes less than one-third the power

          Where are some features of LCD screens?
          Lightweight and compact
          Consumes less than one-third of the power than does a CRT monitor
          Ideal for notebook and handheld computers

          What is a Printer ?
          Output device that produces text and graphics on paper
          Result is hard copy or printout
          Two orientations : Portrait and Landscape

          Types of printers :-
          Impact printers
          Non-impact printers
         What is an impact printer?
          Forms characters by striking a mechanism against ink ribbon that physically 
           contacts paper
          Ideal for printing multipart forms
          Can withstand dusty environments, vibrations and extreme temperatures
          Types of impact printers :
          Dot-matrix printer
          Line printer
          What is a Dot-matrix printer?
          Impact printer that produces printed images when tiny wire pins on print head 
           mechanism strike inked ribbon
          Impact printer forms characters by striking mechanism against inked ribbon 
           that contacts paper
          Most use continuous-form paper
  
          How does a Dot-matrix printer work?
          When ribbon presses against paper, it creates dots that form characters and
            graphics
          A higher number of pins (9 to 24) means printer prints more dots per character,
           which results in high

          What is a Line printer?
          High-speed impact printer that prints entire line at a time
          Speed measured in lines per minute (lpm) it can print
          Band printer prints fully formed characters using a hammer mechanism
          Shuttle-matrix printer is high-speed printer that works like dot-matrix printer

         What is a Non-impact printer?
          Forms characters and graphics on piece of paper without actually striking 
           paper.
          Types of non-impact printers :
          Ink-Jet printer
          Laser printer
          Thermal printer
         What is an Ink-jet printer?
          A type of non-impact printer that sprays tiny drops of liquid ink onto paper
          Non-impact printer forms characters and graphics without striking paper
          Prints in black-and-white or colour on a variety of paper types.


          What is the Resolution of  printer?
          Sharpness and clarity
          Measured by number of dots per inch (dpi) printer can output

         What is a Laser printer?
          High-speed, high-quality non-impact printer
          Prints text and graphics in very high-quality resolution, ranging from 600 to
           2,400 DPI (Dots Per Inch).
          Typically costs more than ink-jet printer, but is much faster


          What is a Thermal printer?
          Generally images by pushing electrically heated pins against heat-sensitive paper
          Dye-sublimation printer, also called a digital photo printer
          Uses heat to transfer dye to specially coated paper


          What is a Mobile printer?
          Small, lightweight, battery-powered printer that allows mobile user to print from 
            notebook computer, Tablet PC or PDA while traveling

          What is a Label printer?
o        Small printer that prints on adhesive-type material
o        Most also print bar codes
o        Postage printer has built-in digital scale and prints postage stamps

Ø      What is a Plotter?
o        Sophisticated printer used to produce high-quality drawings
o        Large-format printer creates photo-realistic-quality colour prints


          What is wireless printing?
          Output transmitted to printer wirelessly via infrared light waves or radio waves
          Bluetooth printing uses radio waves
          Devices need to be within 30-foot range

          What is an Audio output device?
          Computer component that produces music, speech or other sound
          Speakers and headsets are common devices

          What is voice output?
          Computer talks to you through speakers on computer

          What is Internet telephony?
          Allows you to have conversation over Web, just as if you were talking on the 
           telephone

          What is a facsimile (fax) machine?
          Device that transmits and receives documents over telephone lines

          What is a Multifunction peripheral?
          Provides functionality of printer, scanner, copy machine and fax machine.

          What is a Data projector?
          Device that takes image from computer screen and projects it onto larger 
           screen.

          What is a Point of Sale (POS) terminal?
          Records purchases, processes credit or debit cards, and updates inventory
          Swipe credit or debit card through card reader, which reads customer’s personal data
            from magnetic strip
          Output from POS terminals serves as input to host computer

          What is an Automatic Teller Machine (ATM)?
          Self-service banking machine that connects to host computer through network

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