Introduction to computer

1. INTODUCTION TO COMPUTERS

2. WHAT IS A COMPUTER?
A computer is an electronic device,
operating under the control of
instructions stored in it’s own memory,
that can accept data, process the data
according to specified rules, produce
results and store the results for further
use.

3. CHARACTERS OF A COMPUTER
Basic characters of a computer:
Speed: The computer can work very fast. It takes
only a few seconds for calculations that we take hours
to complete.
Accuracy: The degree of accuracy in a computer is
very high. Every calculation and details are performed
with the same accuracy.The errors in the computer
are due to human and inaccurate data.

4.  Diligence: A computer is free from tiredness, lack of
concentration, fatigue, etc. It can work for hours
without any errors.
Versatility: A computer can perform completely
different types of tasks.You may use your computer
for prepare payroll slips and the next moment you
may use it for paying electricity bills.
Power of remembering: Any information can be
stored and recalled, for any number of years.

5. No IQ: A computer is a machine and it cannot do any
work without instructions. It is you who decide what to
do and in what sequence.
No feelings: it does not have feelings, emotions,
taste, knowledge and experience.Thus it does not get
tired after long hours of work. It does not distinguish
between users.
Storage: a computer has a large memory where it
stores large data.You can also store data in secondary
devices like floppies, which can be carried to other
computers.

6. CLASSIFICATION OF COMPUTERS
On the basis of size
On the basis of functionality
On the basis of data handling

7. CLASSIFICATION ON THE BASIS OF SIZE
Super computers: The most high performing system
compared to general-purpose computer.They play a
major role in computing tasks in various fields, including
quantum mechanics, weather forecasting, climate
research, etc.

8. Mainframe computers: These are used by big
organisations for bulk data processing such as
statics, census data processing, transaction
processing, etc.

9. Mini Computers: These computers where sold at
much cheaper prices than the main frames.They
were designed for human interaction and
communication. Later they became very popular
for personal uses with evolution.

10. Micro Computers: small, relatively inexpensive
computer with a microprocessor as its CPU. Main
frame computers and Mini computers were
expensive and hard to maintain.These actually
formed a foundation for micro computers.
eg: tablets and smartwatches.

11. CLASSIFICATION BASEDON FUNCTIONALITY
Servers: dedicated computers which are based on
the services they provide to the clients.
Eg: security server, database server
Workstation: These are primarily used by single user
at a time.They are the ones we use in our day to day
personal / commercial work
Information appliances: Basically the ones designed
to perform a limited set of tasks like basic calculations,
browsing the internet, playing multimedia. Eg: mobile
devices

12. CLASSIFICATION BASED ON DATA HANDLING
Analog: a form of computer that uses the changeable
aspects of physical facts such as mechanical and
electrical to model the problem being solved.
Digital: a computer that performs calculations and
logical operations with quantities represented as
digits.
Hybrid: processes both Analog and Digital data. It
accepts Analog signals and converts them to digital
and processes them in digital forms.

13. THANK YOU!