2. This presentation includes following points:
ā¢ Elements of a computer system:-
ā¢ Classification
ā¢ Characteristics
ā¢ Limitations
ā¢ Input and Output Devices
ā¢ Processing and Storages Devices
4. Elements of a Computer System
ā¢ Classification
ā¢ Characteristic
ā¢ Limitations
5. Classification of Computers
On the basis of Purpose/Use
ā¢ General Purpose Computers: Designed to
perform a range of tasks. They have the ability
to store numerous programs.
ā¢ Special Purpose Computers: Designed to
handle a specific problem or to perform a
specific task. A set of instructions is built into
the machine.
6. On the basis of Size:
ā¢ Microcomputers: Microcomputers are
connected to networks of other
computers. It is a small and general-
purpose computer. A single user can
interact with this computer at a time.
ā¢ Mini Computer: A small general-purpose
computer having more storage capacity
and speed. It is designed to
simultaneously handle the needs of
multiple users.
7. On the basis of Size
ā¢ Mainframe Computer: Large
computers, process data at very high
speed.
ā¢ Banks, manufacturers and airlines
are typical users.
ā¢ Super Computers: The largest
computers are Super Computers.
ā¢ Most powerful, most expensive
and fastest.
ā¢ Capable of processing trillions of
instructions per second.
8. On the basis of Functionality/Data Handling
ā¢ Analog Computers: A form of computer that uses
continuous physical phenomena such as electrical,
hydraulic, mechanical quantities. Measurements
are obtained and translated into data.
ā¢ Digital Computers: Performs calculations and
logical operations with quantities represented as
digits (0s and 1s).
ā¢ Hybrid Computers: A combination of computers,
capable of inputting and outputting in both digital
and analog signals. Incorporate the measuring
feature of an analog computer and counting feature
of a digital computer.
9. Characteristics of a Computer
ā¢ Speed
ā¢ Accuracy
ā¢ Diligence
ā¢ Reliability
ā¢ Storage Capacity
ā¢ Multitasking
ā¢ No Decision
ā¢ No Feeling
10. Components of a Computer
There are two components of a computer:
hardware and information stored on the
hardware (software).
ā¢ Hardware: Physical parts (Electronic
and mechanical): Key board, Mouse,
Monitor, Hard disk, Mother board and
Printer.
ā¢ Software: Data and computer
programs: Windows XP, Windows 10.
11. Devices of a Computer
There are four types of devices used in a computer:
ā¢ Input Devices
ā¢ Processing Devices/Unit
ā¢ Storage Devices
ā¢ Output Devices
12. Input Devices
Input devices are used to send data and instructions by the user or from
another computer
ā¢ Keyboard
ā¢ Mouse
ā¢ Joystick
ā¢ Microphone
ā¢ Webcam
ā¢ Scanner
ā¢ Barcode Reader
ā¢ Touch Monitor
13. Processing Devices/Unit
ā¢ Processing devices are responsible
for processing of information within
the computer system.
ā¢ Example: CPU and motherboard.
14. Output Devices
Output devices return processed data to the user or another system
ā¢ Monitor
ā¢ Speaker
ā¢ Printer
ā¢ Projector
15. Storage Devices
Data is stored for later use on storage
media. Types of storage media are:
ā¢ Primary storage media: Random
Access Memory (RAM), ROM (Read
Only Memory)
ā¢ Secondary storage media: Compact
Disk (CD ROM), Floppy Disk,
Cartridge Tape, USB drive/Pen Drive,
Memory Stick, Hard Disk
17. Limitations of Computer
The computer is totally dependent on human.
ā¢ No common sense and feelings.
ā¢ No imagination.
ā¢ Cannot detect an error in logic.
ā¢ Only an expert user can work on it.
ā¢ Cannot take its own decisions.
ā¢ No Self-Intelligence and No Thinking.
ā¢ No Learning Power