This document provides information about the basic components of a computer system. It discusses the main input devices like the keyboard and mouse, and output devices such as the monitor and printer. It also describes the central processing unit (CPU) as the "brain" of the computer. Other core internal components that are covered include the motherboard, random access memory (RAM), hard disk, power supply, and cabinet/case. Peripheral devices such as USB drives and networking equipment are also mentioned. Specifications, brands, and typical price ranges are given for many of the hardware components.

1. Computer… An electronic machine
Monitor
Mouse
Printer (Inkjet)
Key Board
Cabinet
UPS
PPT 8.1.1

2. Computer’s
INPUT UNITS : Key Board, Mouse, Scanner, Barcode Scanner, Pen Drive, CD, DVD
OUTPUT UNITS : Monitor, Printer, Speaker, Pen Drive, CD, DVD
CPU : Brain of Computer ( Processor )
PPT 8.2.2
PPT 8.1.2

3. Key Board
Looks typewriter
Standard keyboard – 101 to 104 keys
PS2 as well as USB connector
Various brands (e.g. TVSE, Logitech, HP, etc…)
Price – Rs. 200/- to Rs. 1500/-
Keyboard is the input device that enables user to
enter data into a computer, control cursor and pointer
locations, and to control the dialog with the
computer.
PS2
USB
PPT 8.1.3

4. Mouse
Just looks like a Mouse
Optical Mouse
PS2 as well as USB connector
Various brands (e.g. Logitech, HP, etc…)
 A mouse is a handheld pointing device for computers to
control the movement of the cursor or pointer on a display
screen.
 Price :150/- to Rs. 500/-
PS2
USB
PPT 8.1.4

5. Monitor
Just looks like a TV
Type : Digital – Flat – LCD having different size
COM port available
Various brands (e.g. Samsung, Philips, LG, HP, etc…)
Price – Rs. 4000/- to Rs. 10000/-
Monitor, also known as display screen, is a computer peripheral
device capable of showing still or moving images generated by a
computer and processed by a graphics card.
PPT 8.1.5

6. Cabinet
It is a Box containing –
Mother Board, CPU,
SMPS, RAM, PCI Cards,
Hard Disc, CD/DVD
Drive, Floppy Drive,
Ports, etc…
PPT 8.1.6

7. CPU (Central Processing Unit)
A central processing unit
(CPU), also known as
processor. It processes,
instructions and data contained
in the software.
There are different CPU
designs. But in general, the
CPU consists of the control
unit, the arithmetic and logic
unit (ALU) and memory.
Price :
PPT 8.1.7

8. SMPS (Switch Mode Power
Supply)
Switch Mode Power
Supplies is the latest
technology for high
efficiency power
supplies. The switch
mode power supply,
uses a high frequency
switch to maintain the
output voltage.
Price :
Rs. 600/- to 4000/- PPT 8.1.8

9. RAM (Random Access Memory)
Random Access Memory (RAM) is a volatile
memory whose contents can be accessed in any
(i.e., random) order.
Higher the RAM – Faster the Computer
Price :
Rs. 700/- (128 MB), Rs. 1500/- (512 MB)
PPT 8.1.9

10. PCI Cards (e.g. NIC Card, Sound Card,
etc…)
Network Interface Card. A
physical circuit card to connect a
computer or any other device
(such as a printer) to a network
using RJ-45, Cat 6 & Switches. It
is also called a LAN Card.
Price :
Rs. 150/- to Rs. 500/-(for
Network Interface Card (LAN
Card))
PPT 8.1.10

11. Networking Devices
RJ – 45
(Rs. 2/- to
12/-)
Cat -6
(Rs. 18/- Per mtr) 16 Port
Switch
Crimping
Tool
Using the RJ-45 Connectors, Cat 6
Cable and Switches, Networking can
be established with computers. PPT 8.1.11

12. Hard Disk
Hard disk drive, also known as hard drive or hard disk, is
a magnetic disk to store large amounts of computer data. A
hard disk uses rigid rotating platters (disks). It stores and
retrieves information from a magnetic surface.
Brand Name : Seagate, Samsung, IBM, etc…
Price :
Rs. 2200/- (80 GB), Rs. 2650/- (160 GB), Rs. 3500/- (250
GB)
PPT 8.1.12

13. Other Accessories
CPU FAN
(Rs. 300/- to
700/-)
PS2
Connect
or
USB
Connecto
r
Spike
Guard
PPT 8.1.13

14. Printer
Printers are output devices which
help in printing a hard co py.
Type : Dot Matrix Printer
(80 – 132 Columns) (Rs. 5000/- to 15000/-)
Laser Jet (Rs. 5000/- to 20000/-)
Ink Jet (Rs. 2500/- to 8000/-)
Brands: Epson, TVS, Canon, HP,
Samsung PPT 8.1.
14

15. Mother Board
A motherboard is the
central or primary circuit
board containing a complex
electronic system.
Sometimes abbreviated as
mobo. All Peripherals and
devices are connected to the
different slots on this.
Price :
Rs. 2500/- to 15000/-
PPT 8.1.15

16. Mother Board
All slots will be serially
numbered and functions
stated.
1 – Joint Mouse & Key Board here
2 – Attached Pen Drive & USB Printer also
3 – Attached Printer (Dot Matrix)
4 – Attached Processor (CPU)
5 – For Graphic Card
6 – Battery for Date & Time
7 – Slot for Hard Disk & CD-DVD Drive
8 – Slot for RAM
9 – Slot for Floppy Controller
10 – CPU fan power socket
11 – SMPS Socket
PPT 8.1.16

17. UPS (Uninterrupted Power
Supply)
Electronic and computer-
based equipment for high
quality uninterrupted power
supply.
Price : Depends on KVA (Kilo
Volt Ampere) and the backup
period.
Higher the Backup Time –
More the Cost
PPT 8.1.17

18. Computer… An electronic machine
Thank You…