Introduction to Computer

1. INTRODUCTION TO COMPUTER
APPLICATIONS
LEC# 1
Course code: IT-101
Credit hours: 3.0
Text Book: Introduction toComputers by Peter Norton

2. COURSE WILL BE EVALUATED ON
THE FOLLOWING BASIS’S:
MID TERM 25%
SESSIONAL WORK 25%
FINAL TERM 50%

3. What is Computer?
▪ An electronic machine that get the data as
input, process it and give us information as
output, and store it.
▪ Data
▪ Input
▪ Process
▪ Out put
▪ Information
▪ Storage

4. ADVANTAGES OF COMPUTERS
▪ High Accuracy
▪ Superior Speed of Operation
▪ Large Storage Capacity
▪ User-friendly Features
▪ Portability
▪ Platform independence
▪ Economical in the long term

5. Types of Computer
▪ Computers are classified in a variety of ways
depending upon the principles of working,
construction, size and applications.
 Analog Computers
 DigitalComputers

6. ANALOG COMPUTERS
▪ The computers that process analog signals
are known as Analog Computers.The analog
signal is a continuous signal.
 For example, sine wave is an analog signal.
▪ The analog quantities are based on decimal
number systems.
 Examples ofAnalog computers are theABACUS
etc.

7. DIGITAL COMPUTERS
▪ Computers that process digital signals are
known as Digital Computers.The Digital
signal is a discrete signal with two states 0
and 1.
▪ In practice, the digital computers are used
and not analog.
 Examples personal computers, supercomputers,
mainframe computers etc.

8. Computers for Individual Users
▪ Personal Computer
 PC is the term referred to the computer that is
designed for use by a single person.
 PCs are also called microcontrollersbecause these
are smaller when comparedto mainframes and
minicomputers.
 The term ‘PC’ is frequently used to refer to
desktop computers.Although PCs are used by
individuals, they can also be used in computer
networks.

9. Desktop Computer
▪ This is the most commonly used personal
computer.
▪ It comprises of a keyboard, mouse, monitor and
system unit.
▪ The system unit is also known as cabinet or
chassis.
▪ It is the container that houses most of the
components such as motherboard, disk drives,
ports, switch mode power supply and add-on
cards etc.
▪ The desktop computers are available in two
models- horizontal model and tower model.

10. Workstations
▪ It is a specialized, single user computer.
▪ It has more power and features than a
standard desktop Pc.
▪ Mostly used by scientists, engineers etc.
▪ They have high resolution large screens.

11. Laptops / Note Book Computers
▪ Are also called notebook computers.
▪ These are the portable computers.
▪ They have a size of 8.5 x 11 inch and weigh
about three-to-four kilos.

12. Tablet PCs.
▪ It is newer development in portable, full
featured computers.
▪ They are lighter than normal note book
computer.
▪ Can accept input from a pen like device called
stylus.

13. Palmtops
▪ Palmtops are also called handheld computers.
▪ These are computing devices, which are small
enough to fit into your palm.
▪ The size of a palmtop is like an appointment book.
▪ The palmtops are generally kept for personal use
such as taking notes, developing a list of friends,
keeping track of dates, agendas etc.
▪ The Palmtop can also be connected to a PC for
downloading data.
▪ It also provides value-added features such as voice
input, Internet, cell phone, camera, movie player
and GPS.

14. Personal Digital Assistant
(PDA)
▪ Also called Smart phones
▪ It is the palm type computer. It combines pen
input, writing recognition, personal
organizational tools and communication
capabilities in a small package.

15. THE END