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                    The  speed  of  a  CPU  is  measured  in  Megahertz.  Higher  the  value,  faster  is  the
                    information processed by the CPU.


                      OUTPUT DEVICES


                  The output devices are used to display the information and result of computation
                  to the user. Some of the output devices are:
                  Monitor


                  The monitor is one of the most familiar output device. It is
                  called the Visual Display Unit (VDU). The images that you
                  see on the monitor are made up of tiny dots called pixels.
                  The clarity of the images depends on the number of dots/
                  pixels on the screen per inch. The maximum no. of dots per
                  inch (dpi) will give you more clarity or better display

                  Nowadays,  monitors with Liquid Crystal Display  (LCD)
                  screens have become very popular because of the clarity of                         Monitor
                  the images and the slim shape of the monitor.

                  Printer


                  A printer is an output device that allows to print the work done on the computer
                  on a sheet of paper. Printers are categorised as impact or non-impact depending
                  on their working. Impact printers create an image on a paper by striking the paper
                  with a metal. Non-impact printer create an image on a paper by spraying ink on
                  the paper. Some of the common printers are:


                        Dot matrix printer
                        Dot matrix printers work like a typewriter. The printer
                        head  strikes the  paper  and  ink ribbon  to  print  a
                        character. It is an impact printer.
                                                                                               Dot matrix printer


                                                  Inkjet printer

                                                  Inkjet  Printers  are  non-impact  printers.  Printing  is
                                                  done line-by-line by spraying ink on a sheet of paper.
                                                  These printers are much faster than dot matrix printers.
                                                  However, these are more expensive and consume more

                     Inkjet printer               ink. Inkjet printers use ink cartridges.



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