Components of Computers:

Computer is an electronic Data processing machine. It made up of various devices, which help you to interact. Process it and output is the result, a computer system has three essential parts

INPUT (To give instructions to system from user)

CENTRAL PROCCESSING UNIT (CPU)

OUT PUT (To give output from system to user)

Block Diagram of a Computer:

 The computer consists of three parts: Input Device, CPU and output device.

 

  

Input Device: This device is used to give instructions from the user to system using Input Device. Ex: Keyboard, Mouse, Scanner, Etc., 

Keyboard: This is attached to a micro computer or the terminal of a mini large computer. A keyboard is similar to the keyboard of a typewriter. It contains alphabets digits special characters and some control keys, When a key pressed, an electronic signals is produced which is detected by an electronic circuit called keyboard encoder. A Keyboard encoder may be special IC or single chip microcomputer used as encoder. The function of an encoder is to detect which key has been pressed and send a binary code.

Central Processing Unit:

 This is also called system Unit, which is a technically known as Microprocessor CPU is the brain of computer. It is made of three units:

  Ø  Control Unit:  The control section of the CPU maintains and directs the operations of the entire system. It acts the central nervous system for all components through it does not process any data.

  Ø  Arithmetic and Logical Unit (ALU): ALU processes the data entered. All types of processing, Mathematical calculations, comparison decision making and processing of non numeric information take place in ALU and data is once again moved RAM

  Ø  Memory Unit:  Memory refers to the storage space in computer. Memory stores the data entered as well as the result given by the computer. Memory works on the application of binary system. The basic unit of memory is byte. Memory units can be divided into two sub parts :
    (a) Primary storage        (b) Secondary Storage

Output Device: This device is used to give Output from system to user using output Device. Ex:  Monitor, Printer, Etc., 

Monitor: It is also called as Video Display Unit. It accepts programming instructions a sometimes a monitor is also referred to as a video display terminal.