Block diagram of a computer

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“A computer may be a machine that accepts data as input, processes that data using programs, and outputs the processed data as information. Many computers can store and retrieve information using hard drives”



A diagram of a computer gives you the picturing of a computer that how it works inside. otherwise you can say that, during a computer diagram , we’ll see how a computer works from feeding the info to getting the result.

Here is that the diagram of a computer system:


In the above diagram, both control (control unit or CU) and arithmetic & logic unit (ALU) combined called as Central Processing Unit (CPU).

Let’s describe all the parts as included within the above diagram one by one.

  1. The Processor Unit (CPU):

It is the brain of the pc system.

All major calculations and comparisons are made inside the CPU and it’s also liable for activation and controlling the operation of another unit.

This unit consists of two major components, that are arithmetic logic unit (ALU) and control unit (CU).

   2.Arithmetic Logic Unit (ALU)

Here arithmetic logic unit performs all arithmetic operations like addition, subtraction, multiplication, and division. It also uses logical operation for comparison.

  3.Control Unit (CU)

And the control unit of a CPU controls the whole operation of the pc . It also controls all devices like memory, input/output devices connected to the CPU.

CU fetches instructions from memory, decodes the instruction, interprets the instruction to understand what the task is to be performed and sends suitable control signals to the opposite components to perform for the required steps to execute the instruction.

  4.Input/output Unit:

The input/output unit consists of devices wont to transmit information between the external world and memory .

The information fed through the input unit is stored within the computer’s memory for processing and therefore the outcome stored in memory are often recorded or displayed on the output medium.

  5.Memory Unit:

The memory unit is an important component of a computer . it’s where all data intermediate and finds results are stored.

The data read from the most storage or an input unit are transferred to the computer’s memory where they’re available for processing.

This memory unit is employed to carry the instructions to be executed and data to be processed.

6.Disk Storage Unit:

Data and instruction enter into a computing system through data input device need to stored inside the pc before actual processing start.

Two sorts of storage units are the first and auxiliary storage units.

A.Primary Storage Unit:

Primary memory features a direct link with the input unit and output unit. It stores the input file , calculation result.

B.Secondary Storage Unit:

The primary storage isn’t ready to store data permanently for future use. So another sorts of storage technology are required to store the info permanently for an extended time, it’s called secondary or external storage .

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