Official NCERT Book for Class 11 Computer Science: Chapter 01 Computer System
Review the NCERT Book Class 11 Computer Science Computer System designed for Class 11 Computer Science students. Published under the latest NCERT guidelines for 2026-27, this chapter-wise resource supports daily study and targeted revision.
Chapter-wise Study Material: Chapter 01 Computer System
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1.1 INTRODUCTION TO COMPUTER SYSTEM
A computer is an electronic device that can be programmed to accept data (input), process it and generate result (output). A computer along with additional hardware and software together is called a computer system.
A computer system primarily comprises a central processing unit (CPU), memory, input/output devices and storage devices. All these components function together as a single unit to deliver the desired output. A computer system comes in various forms and sizes. It can vary from a high-end server to personal desktop, laptop, tablet computer, or a smartphone.
Figure 1.1 shows the block diagram of a computer system. The directed lines represent the flow of data and signal between the components.
1.1.1 Central Processing Unit (CPU)
It is the electronic circuitry of a computer that carries out the actual processing and usually referred as the brain of the computer. It is commonly called processor also. Physically, a CPU can be placed on one or more microchips called integrated circuits (IC). The ICs comprise semiconductor materials.
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Official NCERT Textbook PDF: Class 11 Computer Science Chapter 01 Computer System
NCERT Book Class 11 Computer Science Chapter 01 Computer System
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