What is a Computer ? A Computer is an electronic device that

can perform - Mathematical Operation. Logical Operation. Graphical Operation.

COMPUTERCOMPUTER

Speaker

System Unit

CPU

Monitor

MouseKeyboard

Application of computer in Our Daily Life

RAILWAY

BANKING

Benefits of Computer High Speed Accuracy Storage Automation Diligence Versatility

Limitation of Computer Zero IQ (Intelligence Power) No Common Sense

Basic Concept of Computer

INPUT PROCESS OUTPUT

Data ProcessingMeaningful Information

(Raw Material)

INPUT OUTPUTPROCESSING

WASHING

HISTORY OF COMPUTER

1617

Computer system

Hardware Software User

Computer System

What is Hardware ? All electronic parts of computer that we can

touch and feel are called hardware. Such as-

Keyboard

Mouse

Monitor

Printer

What is Software ? The set of instruction is called a program and

a set of interlinked program is called software. Such as-

Ms Power Point Ms Word Ms Excel Ms Paint

What is a User ? A person who uses computer is called a

user.

Keyboard Motherboard Monitor Floppy DiskMouse CPU Printer CDScanner Video Card Speaker DVDMicrophone Sound Card Hard DiskWeb Camera Pen

Drive

HARDWARE

INPUT DEVICE PROCESS DEVICE OUTPUT DEVICES MEMORY DEVICES

INPUT DEVICESDevices which provide data and instructions to the computer are called input devices. Such as –

Keyboard MouseScanner Microphone Web Camera

Keyboard

Mouse

Scanner

Microphone

Web Camera

Motherboard

Parts of C.P.U

CU is responsible for ALU is responsiblecontrolling all hardware for all arithmeticoperations. and logical operations

C.P.U

CU(Control Unit)

ALU(Arithmetic & Logical Unit)

Sound Card

Video Card

There are two type output devices

Monitor Printer Speaker

Output Devices

Softcopy Output Devices Hardcopy Output Devices

Monitor

Speaker

Printer

Ink jet printers (non-impact printer) 

Laser printers (non-impact printer)

Dot-matrix printers (impact printer) 

There are two types of memory

Memory

Primary Memory Secondary Memory

RAM(Random Access Memory)

ROM(Read Only Memory)

RAM

ROM

Secondary Memory Devices

Floppy Disk Compact Disk Digital Video Disk Hard Disk Pen Drive

Floppy Disk

Compact Disk

Digital Video Disk

Hard Disk

Pen Drive

Unit Information Kilobytes, megabytes, gigabytes and terabytes are

units form measuring the capacity of a storage device.

8 Bits = 1 Byte 1024 Bytes = 1 Kilobyte (KB) 1024 KB = 1 Megabyte (MB) 1024 MB = 1 Gigabyte (GB) 1024 GB = 1 Terabyte (TB)

Block Diagram of Computer

CU

ALU

Input UnitMemory(RAM)

Output UnitData Result

Desktop Computer

Laptop Computer

Handheld Computer

Tablet Computer