Block diagram of computer

 

Here is the block diagram of a computer explained

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Main Blocks of a Computer

A basic block diagram of a computer consists of four main units:

1. Input Unit

   • Devices like keyboard, mouse, scanner, microphone, etc.

   • It takes data/commands from the user and converts them into a form (binary) the computer can understand, then sends it to the memory.

2. Memory Unit

   • Primary Memory (RAM): Temporary storage for running programs and data.

   • Secondary Memory (HDD, SSD, pendrive, etc.): Permanent storage for files, OS, and applications.

3. CPU (Central Processing Unit)
   This is the “brain” of the computer and has two parts:

   • ALU (Arithmetic Logic Unit): Performs calculations (+, −, ×, ÷) and logical operations (comparisons, decisions).

   • Control Unit (CU): Controls all other units, fetches instructions, and manages timing and data flow.

4. Output Unit

   • Devices like monitor, printer, speakers, etc.

   • They show or give the processed result to the user.

Simple Data Flow (How to Draw the Diagram)

Draw the blocks in this order and connect them with arrows (→):

1. Input → Memory

2. Memory ↔ CPU (ALU + CU)

3. CPU → Memory (intermediate/final results)

4. Memory → Output

This simple layout clearly shows how data moves inside a computer