Page 16 - CA_165_V2.0_C9_Flipbook
P. 16

Any sort of communication involves a sender, a receiver and a communication channel.

                                                                MEDIUM
                            SENDER                                 OF                              RECEIVER
                                                           COMMUNICATION



                  l    Sender is the one who transmits the data, i.e., the Source of information.

                  l    Receiver is the one who accepts the data, i.e., the Destination of information.

                  l    Communication Channel is the medium through which data is transferred (i.e., air, wires, waves,
                       satellite connections, etc.) from sender to receiver and vice versa.
                  When the communication is  established or resources are shared between multiple  users at different
                  places then the communicating devices or users are said to be in a Network.
























                    COMPONENTS OF A COMPUTER SYSTEM

                  A computer system functions with the help of Hardware and Software components. The physical
                  components, which can be touched or felt are called the hardware components, whereas the components
                  that cannot be touched or felt, such as instructions, data etc. form the software component of the system.
                  Keyboard, Mouse etc. are hardware and MS Word, Windows etc. are software.
                  Hardware is the electro-mechanical part of a computer that is capable of computing and manipulating
                  information, whereas software is a collection of instructions or programs which directs and coordinates
                  the functions of computing and manipulating. Software is portable which means it can be easily moved
                  from one device to the other, whereas hardware cannot be transferred easily from one place to the other.
                  Hardware is easily replaceable, but software is not.

                  A computer is an instruction driven device that accepts data, processes it and produces the desired results
                  in the form of information. Data are fed into the computer through the Input devices which are then
                  Processed inside the CPU and then results are displayed through the Output devices. Thus, a computer
                  system consists of input devices, output devices and processing device.

                  Input Devices

                  There are various types of input devices. Some of the common input devices are Keyboard, Mouse, Joystick,
                  Scanner, OMR, OCR, MICR, Light Pen, Microphone, Bar Code Reader, Web Camera, Digital Camera, etc.

                   14    Touchpad Computer Applications (Ver. 2.0)-IX
   11   12   13   14   15   16   17   18   19   20   21