CHAPTER 1 INTRODUCTION TO COMPUTERS By : Jasmeet Khosa
May 13, 2015
CHAPTER 1
INTRODUCTION TO COMPUTERS
By : Jasmeet Khosa
What is a computer ?
How is computer defined ?
•Electronic device operating under the control of instructions stored in its own memory
Accepts Data Processes Data into Information
Produces and stores results
What is a computer ?
What is the information processing cycle ?• Input• Process• Output• Storage• Communication
The components of a computer ?
What is an input device ?•Hardware used to enter data and instructions.
What is and output device ?• Hardware that conveys information to one or more people.
What is a system Unit ?•Case containing electronic components used to process data.
The components of a computer ?
What are the two main components on the motherboard ?
Central Processing Unit (CPU)
* Also called as processor.
Memory
The components of a computer ?
What is storage?•Holds Data, instructions and information for future use.•The two components of storage are:
Storage Media
Storage Device
The components of a computer ?
Examples of storage media are:
Portable, thin memory cards
Compact Disk (CD)
Hard Disk
USB flash driveFloppy Disk
The components of a computer ?
What is a communications device ?
Hardware components that enables a
computer to send and receive Data,
instructions, and information.
Occurs over cables, telephone lines,
cellular radio network, Satellites, and others transmission media.
ADVANTAGES AND DISADVANTAGES OF USING COMPUTERS ?What is the advantages of using computers ?
Speed
Communications
Storage
Reliability
Consistency
ADVANTAGES AND DISADVANTAGES OF USING COMPUTERS ?What is the disadvantages of using computers ?
Violation of privacy
Impact on Labor Force
Health RisksImpact on
Environment
Network and the internet ?
What is a network ?•Collection of computers and devices connected together.
Communications Device
Enable a connection between computers
One type is a modem
Transmission Media
Cables
Telephone lines
Satellites
Cellular radio
Network and the internet ?
What are the reasons to internet ?
To share
Resources
Hardware devices
Software programs
Information
Data
To save time and money
Network and the internet ?
Why do users access the internet ?
1. Communication2. Information3. Shopping4. Banking and investing5. Classes6. Entertainment
COMPUTER SOFTWARE?
What is a software ?
Consists of a series of
instructions that tells the
computer what to do
Also called a program
COMPUTER SOFTWARE?
What is system software ?• Programs that control or maintain the operations of the computer and its devices.
What is application software ?• Programs that performs that perform specific tasks for users.
What is a programmers ?• Someone who develops applications or system software.
Categories of computers ?
What are the categories of computers ?
Microcomputers
Mobile computers and mobile devices
Midrange Servers
Mainframes
Supercomputers
Embedded Computers
Categories of computers ?
What are the categories of computers ?Under microcomputers there are :
Desktop Laptop Tablet Pc
PDA Palm PC Net book
SERVERS ?
What types of servers are there ?
• Midrange server -Powerful, large computer that supports up to a few thousand computer.
• Mainframe server-Very powerful, expensive computer that supports thousands of computers.
• Supercomputer-The faster, most powerful, most expensive computer. Used for application requiring complex mathematical calculations.
Elements of an information system ?
What are the information system elements ?
Hardware
ProceduresPeople
DataSoftware
Computer applications in society ?
Education Finance Government Healthcare Science Publishing Travel Industry
Question ?
1) Give me few example of who needs and uses
a power computer?
Question ?
• Engineers • Scientists• Architects• Desktop publishers
• Graphic artists
Question ?
2) What are the
few functions of a PDA ?
Question ?
• Calendar• Appointment
book• Address book• Calculator• Notepad