CBSE Class 11 Computer Science 2025-26 Notes for Chapter 1

CBSE Class 11 Computer Science 2025-26 Notes for Chapter 1

In this article we providing information regarding latest CBSE Class 11 Computer Science 2025-26 Notes for Chapter 1.

CBSE Class 11 Computer Science 2025-26 Notes for Chapter 1

We are providing To the Point Information for your examination purpose

Unit 1 – Computer System and Organization

Chapter 1 – Introduction to Computer System

Introduction to Computer System:

  • A computer is a electronic device that takes data as input, process it under some previously loaded program (set of Instruction called program) and produces some meaningful output.

Characteristics of Computer :

  • Speed : The speed of computers is very fast. It can perform in a few seconds the amount of work that human beings can do in an hour. The unit of speed of the computer is Hertz.
  • Accuracy : Accuracy of computer is very high or in other word we can say that if program design is very good, Computer cannot do any mistakes.
  • Alertness : Computer is a machine so it does not get tired and hence can work for long time without creativity any error or mistake.
  • Versatile : A computer can be used for many tasks like writing, calculating, gaming, designing etc. Just by changing the program or application.
  • Automation : Once programmed, a computer can perform tasks automatically without needing use intervention.
  • No IQ : A computer cannot make decisions on its own. It only follows the instructions given by a human (programmer)

Elements of a Computer System Set up:

  • There are mainly five elements of a computer system.
  1. Hardware – Physical part of the computer system. (Key board, Mouse, Monitor, Printer, Processor)
  2. Software – Set of Programs. (Web Browsers, MS Office, Antivirus)
  3. User – The most important element of a computer system is its users. We cannot imagine the computer world without human beings. The person who uses the computer and gives it instructions.
  4. Data – Data is also an important element of a computer system because the entire computer system is based on data itself. Data is used everywhere on the computer. (Text, Audio, Video, Storage)
  5. Procedures – Procedures are the rules, instructions and guidelines for using the computer system properly. (Installation steps, IT policies)

Components of Computer System

  • There are basically three main components of a computer system.
    • Input Unit
    • Process Unit
    • Output Unit
  • Our computer system is based on these three main components.
Input Unit :
  • The main function of this unit is to take data, commands or instruction.
  • To receive data from the user or any other means input devices are used.

Input Devices :

  • Input devices convert the input data into a digital form that is acceptable by the computer system
  • Some examples of input devices include keyboard, mouse, scanner, touch screen etc.

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Thanks to Beloved Readers.

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