This document provides an introduction to computer applications. It discusses the components of a computer and how they work together. It also outlines the different types of computers like analog computers, digital computers, and computers for individual users such as desktops, workstations, laptops, tablets, palmtops and personal digital assistants. The document concludes by stating the course will be evaluated based on midterm, sessional work and final term exams.

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