A computer is a programmable device that processes data and can perform mathematical and logical operations. It consists of both hardware and software. Key hardware components include the CPU, RAM, hard drive, motherboard, graphics card, power supply, and various input/output devices like the keyboard, mouse, and monitor. Software like operating systems and applications allow the hardware to function. Drivers are also needed to allow operating systems to communicate with hardware components.

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2. • A computer is a programmable device that
stores, retrieves, and processes data.
• A device that computes specially
programmable electronic machine that
perform high speed mathematical or logical
operation.
• Is a collection of entities(hardware, and
software ) that are designed to receive,
process, manage and present information in
a meaningful format.
• uninterruptible power supply 2

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5. 1. Keyboard, mouse, Printer
2. Monitor(LCD)(CRT)
3. Desktop(Case)
4. Mother Board
5. CPU
6. RAM
7. Hard Disk(HDD)(SSD)
8. VGA(Graphics Card)
9. Power Supply Unit
10. LAN Card
11. Modem
12. CD-ROM
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6. • A keyboard is one of the ways to communicate with a
computer.
• Typing a key from the keyboard sends a small portion of data to
tell the computer which key was pressed
• Mouse
• A mouse allows the user to move a pointer displayed on
the monitor and experience a more intuitive interaction
with the computer.
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7. • Printer
• A printer can take an image sent by a computer and
deliver it onto a sheet of paper.
• Scanner
• A scanner can take anything on paper and scan it to
produce a replicated digital image.
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8. • A monitor is what you use to
visualize the graphics data sent
from the computer’s graphics
card.
• LCD(Liquid Crystal Display)
• display that uses LCD technology to
show clear images, and is found
mostly in laptop computers and flat
panel monitors.
• CRT(cathode-ray tube)
• The image on a CRT display is
created by firing electrons from the
back of the tube to phosphors
located towards the front of the
display.
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9. Definition CRT stands for Cathode Ray
Tube.
LCD stands for Liquid Crystal
Display.
Power
Consumpti
on
CRT consumes more power
than LCD.
LCD consumes much less
power than CRT.
Cost CRT is cheaper than LCD. LCD is costlier than CRT.
Speed CRT is faster than LCD in
response time.
LCD is slower than CRT in
response time.
Size CRT is larger than LCD in
size.
LCD is smaller than CRT in
size.
Resolution CRT resolution is quiet lower
than LCD.
LCD resolution is quiet high
than CRT thus have high
image quality support.
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10. • This is the part that holds all of the internal components
to make up the computer itself.
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11. • The motherboard is the main board that is screwed
directly inside the computer case. All other cards and
everything else plugs directly into the motherboard,
hence its name.
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12. • The CPU is basically like the brain of a computer. It
processes all the information on a computational level.
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13. • RAM is a data storage device that can provide fast read
and write access. RAM is also volatile, which means that
it loses all the stored data when power is lost.
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14. • A hard drive is found in most computers. It’s usually a
mechanical drive that stores all the data.
• Apart from storing data, it can also be used as a boot
drive to run the operating system from it.
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15. • An SSD is also a type of hard drive, but it doesn’t have
any moving parts. It consists of a bank of flash memory
that can hold a reasonable amount of data.
• While SSD’s are increasing in size all the time, they
aren’t cost-effective for storing large amounts of data.
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16. • A graphics card processes the data from the
motherboard and sends the appropriate information to
the monitor for it to be displayed.
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17. • A power supply mounts inside the computer case. This
converts the AC mains supply from the wall socket and
supplies the correct DC voltages to all the components
inside the computer.
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18. • LAN card is a piece of hardware which is connected
inside the linking the computer network using the MAC
address for network to work.
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19. • A modem card is an internal type of modem that is
plugged into the PCI slot of a PC motherboard.
• A modem is a communications device that allows a computer to
send and receive data through telephone or cable lines.
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20. • A CD-ROM Drive or optical drive is the device used to
read CD ROM disks.
• CD-ROM drives have speeds ranging from 1x to 72x,
meaning it reads the CD roughly 72 times faster than the
1x version.
• Compact Disc Read-Only Memory, a CD-ROM is an optical
disc containing audio or software data whose memory is read-only.
• As you would imagine, these drives are capable of playing audio
CDs and reading data CDs, including CD-R and CD-RW discs.
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22. • VGA Cable
• Also known as D-sub cable, analog video cable
• Connect one end to: computer monitor, television (PC
input port)
• Connect other end to: VGA port on computer (see image
below)
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23. • DVI Cable
• Connect one end to: computer monitor
• Connect other end to: DVI port on computer (see image
below)
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24. • HDMI Cable
• Connect one end to: computer monitor, television
• Connect other end to: HDMI port on computer (see image below)
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25. • PS/2 Cable
• Connect one end to: PS/2 keyboard, PS/2 mouse
• Connect other end to: PS/2 ports on computer (see
image below)
• Purple PS/2 port: keyboard
• Green PS/2 port: mouse
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26. • Ethernet Cable
• Also known as RJ-45 cable
• Connect one end to: router, network switch
• Connect other end to: Ethernet port on computer (see
image below)
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27. • Audio Cable
• Connect one end to: computer speakers, 3.5mm
headphones, 3.5mm microphone
• Connect other end to: audio ports on computer (see
image below)
• Green audio port: computer speakers or headphones
• Pink audio port: microphone
• Blue audio port: MP3 player, CD player, DVD player, turntable,
electric guitar etc. (line-in port to play and record sounds from the
above devices)
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28. • USB Cable
• For USB computer cable connections, there are two
popular formats: USB 2.0 and the newer USB 3.0
• Since USB was intended to be the one computer cable
connection to replace them all, it's no surprise that the
possible uses for a USB port are quite mind-blowing
• Connect one end to: USB device
• Storage devices
• Input devices
• Output devices
• Wireless adapters
• Data (and charging) cable for mobile devices such as
mobile phone, tablet, MP3 player
• Connect other end to: USB ports on computer (see
image below) 28

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30. • Computer Power Cord
• Connect one end to: AC power socket
• Connect other end to: power supply unit (see image
below), computer monitor
• Note: Always turn off your power supply unit (with the 1-0
switch at the back) before connecting a power cord to it.
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31. • A driver, or device driver, is a set of files that tells a piece
of hardware how to function by communicating with a
computer's operating system.
• All pieces of hardware require a driver, from your internal
computer components, such as your graphics card, to
your external peripherals, like a printer.
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