5. Cont…
ICT-concept merges computing with high-
speed communication links, carrying
data, sound and video.
Example:- telephones, televisions,
appliances, and various hand held
devices.
6. COMPONENTS OF ICT
ICT- refers to technologies that provide access to
information through telecommunications. It is similar to
Information Technology (IT), but focuses primarily on
communication technologies. Includes
Internet
wireless networks,
cell phones, and other communication media.
7. Cont…
Modern ICT have created a
“global village”, in which
people can communicate with
others across the world, as if
they were living next door.
9. What is an ICT System?
An ICT system is a set-up
consisting of hardware +
software + data+ people=ICT
system.
10. Cont…
ICT and computers are not the same
thing.
Computers are the hardware that is
often part of an ICT system.
11. Input, Output and System Diagrams
What comes out of an ICT system is largely
dependent on what you put into the system
ICT systems work by taking inputs (instructions
and data), processing them and producing
outputs that
are stored
18. Cont…
• (Garbage In Garbage Out) "Bad
input produces bad output."
Data entry is critical. All possible
tests should be made on data
entered into a computer.
19. Cont…
is all about why validation is
needed and why accurate
data is valuable.
25. Feedback
It is sometimes good to have feedback
in an ICT system. This is when the
output from a system feeds back to
influence the input and the process
repeats itself
26. Methods used for input to and
output from ICT systems vary a
lot. , you should be familiar
with examples of input and
output formats.
27. For example,
digital cameras to take digital
photographs, scanners to digitize
images for use on a computer, or DVD
players for video playback—so the
correct devices are needed in order to
work with each media format
28. Cont…
-There is a growing tendency for multi-purpose ICT
devices. We can get all-in-one box that can do the
same thing as several different ones did before it
29. Cont…
-There is a growing tendency for multi-purpose ICT
devices. We can get all-in-one box that can do the
same thing as several different ones did before it
30. Cont…
-There is a growing tendency for multi-purpose ICT
devices. We can get all-in-one box that can do the
same thing as several different ones did before it
32. Connecting to the Internet
To connect to the Internet, the following are needed:
1. a computer
2. telephone line (cable being the exception)
3. modem and/or router
4. ISP (Internet Service Provider)
5. Web browser
33. Connecting to the Internet
To connect to the Internet, the following are needed:
1. a computer
2. telephone line (cable being the exception)
3. modem and/or router
4. ISP (Internet Service Provider)
5. Web browser
34. Connecting to the Internet
To connect to the Internet, the following are needed:
1. a computer
2. telephone line (cable being the exception)
3. modem and/or router
4. ISP (Internet Service Provider)
5. Web browser
35. Intranet
-An intranet is a network that works like
the Internet but is only available within a
particular organization, not to the public.
- An intranet have web pages used to
share company specific data within that
company.
36. Cont…
An example of an intranet is a website that is
exclusively used by an airline company to
deliver updates and information to its
workforce. An intranet software allows
companies to build a private, secure network
that can only be accessed by that company's
employees
37. Network
A computer network consists of a number of
computers linked together to allow them to
share resources.
Networked computers can share hardware,
software and data.
Example: You can do any thing being here over
distances remotely.
39. server
Most computer networks have at least one
server.
A server is a powerful computer that provides
one or more services to a network and its
users, for example, file storage and e-mail.
45. Cont…
A server is a computer or system
that provides resources, data,
services, or programs to other
computers, known as clients, over
a network.
46. Types of Networks
Based on Geographical area coverage
There are two types of network:-
1.Local Area Network (LAN)
2.Wide Area Network (WAN).
47. Local Area Network (LAN)
-covers a small area such as one
site or building, e.g., a school or a
university campus.
A school network is usually a LAN.
48. Local Area Network (LAN)
is a computer network that
interconnects computers within a
limited area such as a residence,
school, laboratory, university
campus or office building.
51. Wide Area Network (WAN)
-covers a large geographical
area.
-Most WANs are made from
several LANs connected
together.
52. Wide Area Network (WAN)
WAN is a large network of information that is
not tied to a single location. WANs can
facilitate communication, the sharing of
information and much more between devices
from around the world through
a WANprovider.
56. Cont…
Important points about WANs.
1. The Internet is a WAN.
2. A network of bank cash dispensers is a WAN.
3. LANs are often connected to WANs, for
example, a school or college network could be
connected to the Internet.
4. WANs can be connected together using the
Internet, leased lines or satellite links
73. Cont…
A computer system is a set of
integrated devices that input,
output, process, and store data and
information.
use of computers has increased rapidly
that we can no longer ignore them.
74.
75. is an electronic device that can
accept, store and process
data under the control of a
set of instructions.
What is a Computer?
76. is an electronic device that can
accept, store and process
data under the control of a
set of instructions.
What is a Computer?
81. System unit
It is a box that houses the
motherboard (into which processor
and RAM chips are plugged), power
supply, as well as secondary storage
(Flash, CD, DVD, ..)
System unit
94. A UPS (Uninterruptible Power
Supply) is a battery-operated
device that provides a
computer with electricity if
there is a power failure.
95. The UPS will keep a computer going for
5 to 30 minutes or more. It goes into
operation as soon as the power to your
computer fails. It also stabilizes any
sudden fluctuation in the power supply
129. a ROM chip
, read-only means that the CPU can
retrieve programs from the ROM
chip but cannot modify or add to
those programs.
130. PROM
(Programmable Read Only Memory),
which is a ROM chip that allows you,
the user, to load read-only programs
and data. However, this can be done
only once.
133. PROM
permanent and cannot be
changed. PROMs are used in
digital electronic devices to
store permanent data
134. ROM vs PROM
The key difference from a
standard ROM is that the data is
written into a ROM during
manufacture, while with a PROM the
data is programmed into them after
manufacture.
135. SLOTS
Motherboard has expansion slots —for
expanding the PC’s capabilities—which
give you places to plug in additional
circuit boards, such as those for video,
sound and communications (modem).
141. CMOS Battery
A battery that maintains the time,
date, hard disk and other
configuration settings in the
CMOS (Complementary Metal
Oxide Semiconductor) memory.
148. MEMORY
CAPACITY
is the maximum or minimum
amount of memory a computer or
hardware device is capable of having or
it is the required amount of memory
for a program to run or execute.
152. 3. KILOBYTE
Kilo means one thousand, so a
kilobyte (KB) is approximately
one thousand bytes. Actually,
a kilobyte is 1,024 bytes
153. 4. MEGABYTE
Mega means one million, a
megabyte (MB) is approximately
one million bytes (1,048,576
bytes, or 1,024 KB or 1,024 ×
1,024 bytes, to be exact).
154. 5. GIGABYTE
Giga means one billion. A
gigabyte (GB) is 1,073,741,824
bytes or 1,024 MB (i.e., 1,024
× 1,024 × 1,024 bytes).
172. Features of editing
1. Find and Replace- Command allows us to
find any word
2. Spelling Checkers-compare all words in a
document
3. Grammar Checkers- Check for incomplete
sentences
4. Thesaurus- Alternative word.
Features of editing