SYSTEM UNIT:

 System unit:

                      System unit is a case that contains different electronic components of computer used to process data. All computer system have a system unit. The electronic components in the system unit are connected to motherboard. Motherboard is also know as system board or main board. system board is the communication medium for the entire computer system.

                                                              SYSTEM UNIT

     Two main components of system unit are as follows;  

         CPU:

                  CPU stands for central processing unit. It is also called processor. It is the brain of the computer. It is the most important of the computer. It performs the calculations and comparisons needed for the processing. It also controls the operations inside the computer. A computer cannot work without CPU. All computer must have a central processing unit. 

       Memory:

                   The hardware component that stores data and instruction temporarily is called memory. It is also called primary memory or main memory. It consist of electronic chips mounted on the motherboard. It is used to store input data before processing. It also stores processed data after processing until data is sent to the output device. The main memory is also called volatile because its contents are lost when the computer is turned off.

     Storage Devices:

                                The hardware components used to store data instructions and information permanently are called storage devices. They are called nonvolatile as their contents are not lost when the computer is turned off

              Some examples of storage devices as follows;

 Hard drive :

                   It is located inside the system unit to store data and programs

Flash drive :     

                    It  is portable storage devices used to store documents, photos, audios and                                  videos etc. It can be used to move files from one computer to another easily.

Optical drive :   

                       It is generally used to store software, photos, movies and music.

Memory card: 

                          It is removeable flash memory that is used to store photos, audio files and                                  other contents.

  

        

STORAGE 

              

             Communication Devices:

                                                      The hardware components used to communicate and exchange data, instructions and information with other computers are called communication devices.

              Some examples of communication devices are as follows;

    

          Modem:

                          It is used to connect a computer to the internet.

          Network card:

                                  It is used to connect a computer to a computer network.

         Router:

                       It is used to connect different devices to share data and internet connection.

  COMMUNICATION DEVICES:

:HISTORY OF COMPUTER:

COMING SOON..............