A computer is an electronic device that can perform mathematical, logical, and graphical operations. It consists of both hardware and software components. The hardware includes input devices like keyboards and mice, processing devices like the CPU and memory, and output devices like monitors and printers. The software includes programs like operating systems and applications. A computer takes in data as input, processes it, and produces output in the form of information or results. Computers have various applications in areas like banking, transportation, education and more. They provide benefits like speed, accuracy, storage and automation but lack intelligence and common sense.

2. What is a Computer ?
A Computer is an electronic device
that can perform -
 Mathematical Operation.
 Logical Operation.
 Graphical Operation.

3. COMPUTER
Speaker
System Unit
CPU
Monitor
Mouse
Keyboard

4. Application of computer in Our Daily Life

5. RAILWAY
BANKING

6. Benefits of Computer
 High Speed
 Accuracy
 Storage
 Automation
 Diligence
 Versatility

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

8. Basic Concept of Computer
INPUT PROCESS OUTPUT
Data Processing
Meaningful
Information
(Raw Material)

9. INPUT OUTPUTPROCESSING
WASHING

10. HISTORY OF COMPUTER
1617

13. Computer system
Hardware Software User
Computer System

14. What is Hardware ?
All electronic parts of computer that we can
touch and feel are called hardware.
Such as-
Keyboard
Mouse
Monitor
Printer

15. 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

16. What is a User ?
 A person who uses computer is called a
user.

17. Keyboard Motherboard Monitor Floppy Disk
Mouse CPU Printer CD
Scanner Video Card Speaker DVD
Microphone Sound Card Hard Disk
Web Camera Pen Drive
HARDWARE
INPUT DEVICE PROCESS DEVICE OUTPUT DEVICES MEMORY DEVICES

18. INPUT DEVICES
Devices which provide data and instructions to the
computer are called input devices. Such as –
Keyboard
Mouse
Scanner
Microphone
Web Camera

19. Keyboard

20. Mouse

21. Scanner

22. Microphone

23. Web Camera

24. Motherboard

25. Parts of C.P.U
CU is responsible for ALU is responsible
controlling all hardware for all arithmetic
operations. and logical operations
C.P.U
CU
(Control Unit)
ALU
(Arithmetic & Logical Unit)

26. Sound Card

27. Video Card

28. There are two type output devices
 Monitor Printer
 Speaker
Output Devices
Softcopy Output Devices Hardcopy Output Devices

29. Monitor

30. Speaker

31. Printer
Ink jet printers (non-
impact printer)
Laser printers
(non-impact printer)
Dot-matrix printers
(impact printer)

32. There are two types of memory
Memory
Primary Memory Secondary Memory
RAM
(Random Access Memory)
ROM
(Read Only Memory)

33. RAM

34. ROM

35. Secondary Memory Devices
 Floppy Disk
 Compact Disk
 Digital Video Disk
 Hard Disk
 Pen Drive

36. Floppy Disk

37. Compact Disk

38. Digital Video Disk

39. Hard Disk

40. Pen Drive

41. 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)

42. Block Diagram of Computer
CU
ALU
Input Unit
Memory
(RAM)
Output Unit
Data Result

43. Desktop Computer

44. Laptop Computer

45. Handheld Computer

46. Tablet Computer