The document summarizes the basic components of a computer system. It discusses that a computer system consists of hardware, software, and liveware. It describes the major hardware components including input devices like keyboards and mice, processing devices like the CPU, output devices like monitors and printers, and storage devices like hard disks. It also discusses the different types of software including operating systems, utility software, and application software. Finally, it covers liveware which refers to the users of the computer system.

1. Unit 1
Grade 9

2. Basic Components of a computer System
• Computer system consists of three major components.
✓ Hardware
✓ Software
✓ Liveware

3. Computer Hardware
• Computer hardware is the collection of physical parts of a computer system.
• Hardware devices can be classified into four distinct categories:
• Input devices.
• Processing devices.
• Output devices:
• Storage devices:

4. Input Device
• An input device is a hardware or peripheral device used to send data to a
computer.

5. Examples of input devices
Mouse Barcode Reader microphone
Touch Screen Finger print scanner keyboard
Joystick Flatbed scanner
Lightpen Digital camera
Track Ball Web cam

8. Output Device
• Output devices are devices that receive data or instruction from a computer.
• There are several methods of producing the processed information by a
computer system,
• Softcopy
• Hardcopy
• Sound

9. Soft copy
• Monitors
The monitor size is measured in terms of its diagonal length in inches.
Monitors can be classified into the following types according to the
technology used by them:
CRT (Cathode Ray Tube) Monitor
LCD (Liquid Crystal Display) Monitor
LED (Light Emitting Diode) Monitor

10. Hard copy
• Printer
• plotter

11. sound
• Speaker
• headphones

12. Storage devices
• Storage devices are used to store data
• Hard disk
• Optical disk –CD DVD Blue Ray
• Flash drive
• Magnetic Tape
• Floppy disk

13. Computer Ports

14. • Serial – Mouse
• Parallel –Printer
• USB –Mouse, Keyboard, Printer, Scanner,
• PS/2 – Keyboard, Mouse
• HDMI- monitor, television screen, multimedia projector. Both sound and
video transmitted
• VGA- Monitor,multimedia Projector. Only video transmitted.

16. main types of personal computer
Non-Portable Mobile Use
Server Computer Laptop
Workstation Notebook
Desktop Tablet
All-in-one-computer Smartphone

17. software
• In a computer system, the software is basically a set of instructions or
commands that tells a computer what to do.

18. Type of Software
Type of
software
System
software
Operating
System
Device
Drivers
Utility
Software
Application
Software

19. Operating System
• An operating system (OS) manages
computer’s hardware and software
resources.
• An OS acts a link between the
software and the hardware.
• It provides the interface between
the user and the hardware.

20. examples
• Free and open source – Linux, Ubuntu
• Licensed- Windows 8 , Windows 10

21. Utility software
• Antivirus
• Disk Management Tool
• Disk Clean
• CompressionTool - WinZIp

22. Application Software
• Application software, is a type of software or program that is designed to
complete a specific task.
• Example
• MS Word, Ms Excel, PowerPoint , Media Player,
• Banking System

23. Liveware
• The one who uses a computer is generally referred to as a user. Different
users working in different areas in Information and Communication
Technologies have different designations.

24. Specification of Computer
• Specifications are generally about the common feature of an item.

25. Important factors of computer specifications:
• Technical Features
✓ The Processor
✓ Hard Disk
✓ The Monitor
✓ Main Memory
✓ Video Graphic Adapter
✓ Sound Card
✓ Pre Installed Software

26. Important factors of computer specifications:
• Non-Technical Features
✓ Warranty
✓ Price
✓ Service after-sale

27. Processor
• Speed of Processor – Speed is measured in Hertz(HZ, MHz, GHz) Ex –
1GHz
• Processor Manufacture – Apple, Intel,AMD
• Type of Processors –
Type No of CPU Name
Single Core 1 Pentium I,II,III,IV
Dual Core 2 Dual Core/Core 2 Duo
Quad Core 4 Core i3,i5,i7,i9

28. Hard Disk - • Capacity Of the Hard Disk – 1TB , 2 TB
Monitor - • Size – Monitor size is measured its diagonal length in inches
19 inch
• Monitor Technology – CRT/LCD/LED
Main Memory - • Capacity Of the main memory is measured in units of
bits
• EX- 1GB
VGA Two Types of VGA . Onboard VGA and Separate VGA
Sound Card Built in Motherboard or separate external sound card

29. • Pre-installed Software – check wheather an Operating System has been pre-
installed.
• Free and open source OS- Linux,ubuntu
• Licensed OS - Windows

30. Non-Technical Features
• Warranty – Manufacturer warranty , Extended Warranty, On-Site warranty
• Price
• Service after sale