![]() It performs following tasks:Ībove figure shows the block diagram of a computer. The control unit and ALU are together known as CPU. It is Central Processing Unit of the computer. Thus it is also known as central nervous system of the computer. It controls the flow of data and instructions to and from the storage unit to ALU. It controls all other units of the computer. ![]() When the operations are done, the result is transferred back to the storage unit. Whenever calculations are required, the control unit transfers the data from storage unit to ALU. The ALU can perform basic operations such as addition, subtraction, division, multiplication etc. Without a CPU, we could not run programs on a computer. The CPU is constantly following instructions of computer programs that tell it which data to process and how to process it. The CPU is the brain of a computer, containing all the circuitry needed to process input, store data, and output results. Commonly used secondary memory devices are hard disk, CD etc.Īll the calculations are performed in ALU of the computer system. Central Processing Unit (CPU) Google Classroom. It is used for permanent storage of data. Secondary Storage: The secondary memory is slower and cheaper than primary memory.The data is lost, when the computer is switched off. It is used for temporary storage of data. Primary Storage: This memory is used to store the data which is being currently executed.The storage unit of a computer system can be divided into two categories: It also stores the intermediate results before these are sent to the output devices. Computer architecture can be classified into different types. Computer architecture defines the structure, functionality, and behavior ( Performance Standard ) of a computer system, enabling the execution of programs and the processing of data. This unit holds the data and instructions. It encompasses both the hardware and software aspects of a computer system. Some output devices are printers, monitor etc. ![]() It provides the results of any computation, or instructions to the outside world. It connects the internal system of a computer to the external environment.
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