4. Computer is
special to us in
so many ways
• A computer is a powerful and useful
device which works very fast. It also
helps us learn new skills that are an
important part of today’s digital world.
Now let us have a look at some of the
advantages using a computer.
6. Advantages of using a computer
Speed: The computer allows you to perform tasks very fast. It can process large
amount of data very quickly.
Quality: The computer enables us to create high-quality documents and drawings.
Document can meet required standards.
Reliability: A computer is reliable and accurate. Which means you can depend it to
produce what it is instructed to produce. A computer never mistakes by itself.
Versatility: A computer can perform repetitive jobs efficiently. It can be used for so
many kind of jobs and various field/profession.
8. WHAT A
COMPUTER
CAN DO?
Write and create
documents. E.g. letters,
resumes, reports,
newsletters, brochures,
business cards, invitations
etc.
Check your finances: To
create budget, record
expenses, balance our
check book, calculate our
taxes and monitor our
mortgages.
Perform search: We can
use the computer to
research on any topic by
the use of the internet.
Work with numbers: Using
spread sheet we can work
with numbers.
Schedule your time: We can
use the computer as a
personal organizer to record
upcoming activities,
birthdays, anniversaries,
events, meetings, and
appointment.
Learning: We can use
computer to learn many
things.
Chatting: We can use
computers to chat with
other people by typing
message to them.
Communicate: We can use
computer to send email
message and instant
messages.
Buying and selling: We buy
and sell using the internet.
Playing media: Playing of
music, watching of videos.
Playing of games.
12. INTRODUCTION
• Computer is a programmable
machine. The two principal
characteristics of a computer are:
• It responds to a specific set of
instructions in a well defined manner
and it can execute a pre recorded list of
instructions (a program).
14. TYPES OF COMPUTERS
Digital Computers
Most commonly used computers are
digital computers. They represent
data, whether numbers, letters, or
symbols, in binary form (i.e. ‘0’ and
‘1’) and they work with numbers in the
form of separate discrete digits.
15. TYPES OF COMPUTERS
Digital Computers
Most commonly used computers are
digital computers. They represent
data, whether numbers, letters, or
symbols, in binary form (i.e. ‘0’ and
‘1’) and they work with numbers in the
form of separate discrete digits.
Analog Computers
Analog is a Greek word that denotes
‘similar’. Analog computers use
continuous physical quantities like
pressure, temperature, length, voltage
etc. and convert them into numeric
values.
16. HYBRID COMPUTERS
• Hybrid computers are computer that
exhibit features of analog computers
and digital computers. The digital
component normally serves as the
controller and provides logical and
numerical operations.
18. PURPOSE WISE
COMPUTERS
SPECIAL PURPOSE COMPUTER is
designed only to meet the requirements of a
particular task or application. It therefore doesn’t
posses unnecessary options and is less
expensive.
GENERAL PURPOSE COMPUTER
are designed to meet the needs of many different
applications. The instructions needed to perform
a particular task are wired permanently into the
internal memory.
20. SIZE WISE CLASSIFICATION
1. Embedded Computers
An embedded system is a computer
system with a dedicated function within a
larger mechanical or electrical system,
often with a real-time computing
constraints. It is embedded as part of a
complete device often including hardware
and mechanical parts.
2. Programmable Computers
These computers are very small but
bigger than embedded computers. The
main difference between programmable
and embedded computers is that the
programmable computers can be
programmed by users. Example:
Personal Digital Assistants, Tablets PCs,
Latest mobiles, etc.
21. 3. LAPTOPS AND NOTEBOOKS
These computers are much bigger than
programmable computers. These
computers are placed on your laps. They
are designed to mobility to computer users
22. 3. LAPTOPS AND NOTEBOOKS
These computers are much bigger than
programmable computers. These
computers are placed on your laps. They
are designed to mobility to computer users
4. PERSONAL COMPUTERS
A personal computer (PC) is a multipurpose
computer whose size, capabilities, and price make
it feasible for individual use. PCs are intended to
be operated directly by an end user, rather than by
a computer expert or technician. Computer time-
sharing models that were typically used with
larger, more expensive mini computer and
mainframe systems, to enable them be used by
many people at the same time, are not used with
PCs.
23. 5. WORKSTATION
A workstation is a special computer designed
for technical or scientific applications. Intended
primarily to be used by one person at time,
they are commonly connected to a local area
network and run multi user operating systems.
It has also been used loosely to refer to
everything from a mainframe computer
terminal to a PC connected to a network.
24. 5. WORKSTATION
A workstation is a special computer designed
for technical or scientific applications. Intended
primarily to be used by one person at time,
they are commonly connected to a local area
network and run multi user operating systems.
It has also been used loosely to refer to
everything from a mainframe computer
terminal to a PC connected to a network.
6. MAINFRAMES
Mainframe computers are computers used
primarily by large organizations for critical
applications, such as census, industry and
consumer statistics, enterprise resource
planning, and transaction processing.
25. 7. SUPERCOMPUTERS
A supercomputers is a computer with a high level of computing
performance compared to a general-purpose computer.
Performance of a supercomputer is measured in floating-point
operations per second (FLOPS) instead of million instructions per
second (MIPS).
