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    8.2 ANALOG
                        Analog  Computers  are  those  computers in which  data is
                      represented  in  the form  of continuously varying   physical

                      quantities such as pressure, temperature, voltage, current etc.
                      Analog computers measure things.
                        Uses of Analog computers: Speedometer of a car, Thermometer

                      etc.

                                                                                                             Fig. 8.2
                                                     8.3 DIGITAL
                                                       Digital  Computers  are those  computers that work on
                                                     discrete data  (numeric data). Digital  computers  count
                                                     things.

                                                       Uses  of  Digital  computers  are:  home,  educational
                                 Fig. 8.3
                                                     institutions, office, scientific fields, business etc.

                      Types of Digital computers according to size and performance

                      8.3.1 Supercomputers

                      These  computers are designed  to be used for  doing
                      extremely complicated computations in  the minimum
                      possible time.

                        They are best used in Weather forecasting, Nuclear Science,
                      Aerodynamic modeling etc. These are of very big size.                              Fig. 8.4

                                                  8.3.2 Mainframe Computers

                                                  These are designed to handle large volumes of data and size
                                                  is smaller than supercomputer.

                               Fig. 8.5

                      8.3.3 Minicomputers

                      Minicomputers  are  used  for  scientific  and  engineering
                      computations, business-transaction processing etc.

                      8.3.4 Microcomputers                                                                 Fig. 8.6

                      These are designed to be used by single users for performing basic operations like
                      educational activities, playing games. These are mainly used in homes, offices, shops,
                      school etc.

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