How Does The Cpu Work?

The word CPU stands for  the Central Processing Unit which is a core component  of the computer. It's an important part of your computer which takes data as an input,  processes it and generates output.
The working of the CPU is just like the working of the Human brain.The  Human brain receives the data  from the nervous system, processes those signals and makes decisions about it and then sends them back to the nervous system again. The same work is done by the CPU but in a different manner.

For example: If a user enters (types) the word Computer, the user typed command sent to the CPU is not Computer - it is decoded into machine language by installed software which changes the user entered command into machine understandable language for the further processing and decisions. Then this command is sent to its concerned part where the installed application software takes their decision regarding  that command which came from the user and then generates output on the basis of defined set rules and procedures in installed application software. After this process the command is returned from the software and sent to the processor where the process of conversion from machine language to user language is done again and the user sees the output of his entered command in the form of word Computer.

You may ask: if CPU takes such a long time to process a simple command then what will happen if we write a document or give a command of play the movie? All this whole process is done on electrical signals which travel with the speed of light and the process is much quicker than it takes to explain.

The CPU performs the actual competition inside any computer system. A CPU is also called the micro processor that is made up of millions of microscopic transistors integrated in a circuit on a silicon ship. Hence micro processors are commonly known as a chip.

The micro processor has different parts which perform different functions.

1) Control Unit:
The control unit consequently program decodes and controls the flow of data to and from the ALU ( Arithmetic Logic Unit), registers, caches, primary storage, secondary storage and various output devices.

2) Arithmetic Logic Unit:
The ALU performs the mathematical calculation and logical comparison.

3) Registers:
The registers are high speed storage areas that store very small amount of data and instructions for short periods of time.

The data goes to the main memory, and then it is forwarded to the external unit, then it goes to the program control unit for processing, all the operations are performed in the control unit and is further processed in the arithmetic logic unit.

The register takes the data and keeps it for some time, then stores it in the main memory permanently. So in short the data goes from the main memory and ends up in the main memory.

The central processing unit (CPU) and memory of a computer are located inside the system unit. The central processing unit (CPU) is the brain of a computer.It performs all analytical, computational and logical functions that occur inside the system. The CPU operates by executing a program, processes the data and sends the results at the output, which may be printer or a video display unit.
It is the most complex and powerful part of a computer system.

The central processing unit (CPU) consists of two subunits made up of electron circuits. These are:
1. Arithmetic logical unit (ALU)
2. Control unit (CU)

The central processing unit (CPU) work as following sequence

1. Accept the instruction or data from input unit
2. Store all instructions and data in the memory and retrieve the relevant information as and when required.
3. Interprets the instructions and sends commands to relevant units.
4. Perform all arithmetic and logical operations in the arithmetic and logical unit ALU.
5. Control and coordinates the activities of all other units.
6. Send the result to the output unit when required.