Friday, December 16, 2016

Definition of Computer,Block diagram of the computer

Computer is an electronic device which receives input from the users as in the form of raw data from the input device and stores data input into the storage unit then performing the function and controlling the instruction into the control unit and produce the accurate result into the output unit.     
A computer is an electronic device which takes input and stores the data in memory and manipulation and performing the function to produce accurate result in output device.

      This is the process of entering data and programmers into the computer system. A computer is an electronic device machine like any other machine which takes an input data and performs same processing giving out processed data therefore the input unit takes data from us to the computer in an organized manner for processor keyboard and mouse are the standard way to interact with the computer.


         The process of saving data and instruction permanently is known as storage. Data has to be store into the system before the actual processing starts. It is because the processing speed of CPU is so fast that the data has to be provided to the CPU with same speed. Therefore the data is first stored in the storage unit for the faster access and processing. This storage unit are primary storage and secondary storage of the computer is designed to the above functionality. 
       The task of perform operations like arithmetic and logical operation is called processing the CPU takes data as instruction from storage unit and next all sorts of calculation based an instruction given and the type of data provided. It is then send back to the storage unit. 
 Output Device (How it shows what it is doing?)
      This is the process of producing result from the data or getting useful information similar, the output produced by the computer after processing must also be kept somewhere, inside the computer before being given to human readable form monitor or screen is the primary output device. A printer also output device. For example Monitor, projector etc.
    Function of computer
  • The functions of computer are as follows:
  • It takes raw data as input.
  • Stores data instruction in the memory and use them when required. 
  • Processes the data and convert it into useful information.
  • Generals the output.
  • Controlling all above four steps.

1) High speed:-

  •  Computer is a very fast device.
  •  It is capable of performing calculation of very large amount of data. 
  •  The computer has unit of speed in MICRO second, NONO second and even in PICO second. 
  •  It can perform millions of calculation in a few second as compared to man who will spend many moths do the same tasks. 
2) Accuracy :-
  • In addition to being very fast computers are very accurate. 
  • The calculation are 100% or free. 
  • Computer perform all job with 100% accuracy provided that correct input has been given. 
3) Storage capability :-
  • Memory is very important characteristic of computer. 
  • A computer has much more storage capacity. 
  • It can store large amount of data. 
  • It can store any type of data such as image, videos, text, audio and many others. 
4) Diligence :- 
  •  unlike human beings a computer is free from monotony tiredness and lack of connection. 
  •  It can work continuously without any error and boredom. 
  •  It can do repeated work with same speed and accuracy. 
5) Versatility :-
  • A computer is a versatile machine. 
  • A computer is very flexible in performing the job to be none. 
  • The machine can be used to solve the problems related to various field. 
  • At one instance it may be solving a complex scientific problem and the very next moment it may be playing a card game. 
6) Automation :- 
  • Computer is an automatic machine. 
  • Automation means ability to perform the given task automatically. 
  • Once a program is given to computer i.e. stored in computer memory the program and instruction can control the program execution without human interaction.

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