Pranavi verma-fundamental unit of computer

Fundamental of Computer
Unit 6

This Unit Covers:
 Definition of a Computer
 Functional Components of a Computer
 Central Processing Unit
 Applications of a Computer
 Features of a Computer
 Limitations of a Computer
 Types of Computers
 Convergence of Technologies
Learning Objectives

 Computers have established themselves as an indispensable part in various
segments of human life, such as business, academics, defence strategy,
budgeting, research, engineering, medicine and space exploration.
 We depend on computers for everything—from paying electricity bills to
withdrawing money from bank and so on.
 Today, we can access information on any topic instantly from any place with
the help of computers.
 Technological convergence has almost revolutionized our daily life by
changing the nature and the means we adopt to deal with communication,
work and entertainment.
Introduction

 A computer is an electronic device which is used to perform a variety of
operations on the basis of a set of instructions called program.
 A computer takes input from the user in the form of data or instructions.
 On receiving the instructions from the user, the computer processes the data
and generates some output and displays it to the user.
 When the computer processes data, it becomes information.
 The following figure shows a computer:
Session 1: Defining a Computer

 The description of data, information, hardware and software are as follows:
 Understanding Data
Data denotes unprocessed raw facts and figures, such as a name or a number. A
computer can accept data in various formats, such as text, numbers, audio, video and
images.
 Understanding Information
When a computer processes data and converts it into a form that is useful and
meaningful to the user, it becomes information.
 Understanding Hardware
Computer hardware refers to the physical parts of a computer. Physical parts refer to
those parts or devices that you can touch, such as keyboard, mouse and monitor.
 Understanding Software
Software can be defined as a set of programs necessary to carry out operations for a
specified job. In simple words, software refers to the set of instructions that tell a
computer how to perform a given task.
Data, Information, Hardware and Software

 A computer consists of various components, such as system unit, monitor,
mouse and keyboard.
 The structure of a computer with its components is shown in the following
figure:
Session 2: Exploring Functional Components of a Computer

 The main components of a computer are explained as follows:
 System Unit: Consists of various smaller components, such as Motherboard, Hard disk,
Random Access Memory (RAM), Central Processing Unit (CPU) and Sound card.
 Monitor: Displays the output of a computer. It is a television-like equipment which can
be Cathode Ray Tube (CRT), Liquid Crystal Display (LCD) and Light Emitting Diode (LED).
 Mouse: Refers to a pointing device that perfectly fits in your palm and allows you to
perform certain activities on screen, such as clicking a button and placing the cursor at
a specific location.
 Keyboard: Refers to a device that contains keys to feed information into a computer.
Session 2: Exploring Functional Components of a Computer

 Central Processing Unit (CPU) is a physical device that controls computer
operations.
 It is known as the brain of a computer system as it controls all the operations
of a computer on the basis of the instructions specified by a user.
 It looks like a small chip and is placed on the motherboard.
 The following figure illustrates the basic functionality of a CPU:
Session 3: Introducing Central Processing Unit

 The speed of CPU is measured in Megahertz (MHz) or Gigahertz (GHz).
 The following figure shows a CPU:
 Two typical components of the CPU are:
 The Arithmetic Logic Unit (ALU): It performs arithmetic and logical operations.
 The Control Unit: It extracts instructions from the computer memory, decodes and
executes instructions and takes help of ALU if required.
Session 3: Introducing Central Processing Unit

 The ALU is a digital circuit that is used to execute arithmetic and logical
operations in a computer system.
 The arithmetic operations include addition (+), subtraction (−), multiplication
(*) and division (/).
 The logical operations include greater than (>), less than (<), greater than
equal to (≥), less than equal to (≤), equal to (=) and not equal to (≠).
 Therefore, whenever a computer performs arithmetic operations or makes a
comparison, CPU activates the ALU.
 The result of any arithmetic and logical operation is stored in the computer
memory.
Arithmetic Logic Unit

 The control unit of the CPU supervises and monitors the functions performed
by the entire computer system.
 A special program called supervisor is responsible for controlling the system
operations.
 The instructions in each program are transferred, one at a time, to the
control unit.
 The circuitry of the control unit, in turn, interprets and executes the
instructions.
 When you provide any input, the control unit determines the type of the
instruction and according to the nature of instruction, the control unit guides
the ALU or input/output devices.
Control Unit

 The flowchart in the following figure depicts the functioning of the Control
Unit:
Control Unit

 A computer follows the input-process-
output model.
 Input refers to the process of feeding
data or instructions in a computer.
 Process refers to the work done by the
computer with the help of hardware and
software.
 Output refers to the result that is
obtained when the computer processes
the input.
 The figure shows the basic functioning of
a computer.
Session 4: Working of a Computer

Session 4: Working of a Computer
 Following figure shows a comparison between a mixer and a computer.

 Applications of computers in various fields are shown in given figure:
Session 5: Applications of a Computer

 Some features of a computer are as follows:
 Speed: Computers perform their functions at a greater speed and have the capability of
processing even the most complex computations in a matter of seconds.
 Accuracy: Computers have the ability to provide accurate results as they perform
computations with utmost accuracy.
 Storage capacity: The storage capacity of a computer defines how much information
can be stored in it.
 Reliability: The electronic components in modern computers make them more reliable
as they rarely break or fail.
 Consistency: A computer generates consistent results if provided with the same input
and processes.
 Versatility: Computers are able to perform different tasks in a variety of domains, such
as education, entertainment, health care, accounting and hospitality.
Session 6: Features and Limitations of a Computer

 Some limitations of a computer are as follows:
 No Power to Make Decisions: Computers are unable to take decisions on their own;
instead, they depend upon the input being provided by humans.
 No IQ: Computers are machines that do not have self-intelligence; instead, they need to
be informed from time to time regarding the tasks to be performed.
 No Heuristics: Computers are not able to learn from their past experiences. It implies
that when a computer commits an error once, it would commit the same error again in
a similar fashion.
Limitations of a Computer

Session 7: Types of Computers
Types
of
Computers
Desktop Computer
Personal Digital Assistant
Laptop
Tablet
Smartphone
Mainframe Computer
Supercomputer
Self-destructing Computer
Workstation
Embedded Computer

 Depending upon their accessibility, portability
and user-friendliness, computing devices can be
classified into many categories.
 Some of the commonly used computing devices
are as follows:
 Desktop Computer: A desktop computer is primarily
used in an office or home. It can be used
independently of any other computer; therefore, this
computer is also called Personal Computer (PC).
 Hand-held Computer or Personal Digital Assistant: A
Personal Digital Assistant (PDA) is a lightweight, hand-
held computer designed to be used as a personal
organizer. A typical PDA does not contain a
conventional keyboard; instead, it relies on
recognition of handwritten input through the use of
Stylus (a special type of pen used to write text and
select options on the LCD screen).
Desktop Computer
Personal Digital Assistant

 Laptop: A laptop is a portable computer that is
integrated with a display screen, keyboard,
trackball, processor and memory. The entire
machinery of a laptop runs on a rechargeable
battery.
 Tablet: A tablet is a kind of microcomputer
which offers a host of new features to the IT-
savvy world.
 Smartphone: A smartphone is basically a mobile
phone that provides additional features to
perform day-to-day tasks.
 Mainframe Computer: Mainframes are
designed for multitasking and can be used by
many users simultaneously. Mainframes can
approximately provide up to 12 parallel 650
MHz processors, 32 GB primary memory and
several terabytes of disk storage. The processing
speed of a mainframe computer is around 80 to
550 Mips.
Mainframe Computer
Tablet
Smartphone
Laptop

 Supercomputer: A supercomputer consists of a large number of processors and
occupies a huge amount of space. Supercomputers can process trillions of operations
per second (teraflops). A supercomputer has a large number of CPUs and provides very
fast and high level of computing. For example, Tianhe-2 supercomputer of China
consists of 16000 computer nodes and can process 33.86 petaflops. The following
figure shows a supercomputer:
 Self-Destructing Computer: In an effort to limit the amount of data that computer
thieves can retrieve from stolen computers, a device is being developed that can locate
and, if necessary, destroy a computer’s hard drive. Cyber Group Network (CGN) Corp.
developed the first self-destructing computer. The name of the device is C-4 chip.

 Workstation: The processing of workstations is similar to that of personal computers;
however, workstations have greater memory and more extensive mathematical
abilities. Workstations can be connected to other workstations or personal computers
to exchange data. Generally, these types of computers are used where a high level of
computational abilities is required, such as in scientific, industrial and business
environments. A workstation shows in the following figure:
 Embedded Computer: You must have noticed the circuits of various appliances, such as
televisions and washing machines. In these appliances, there is an inbuilt
preprogrammed computer that performs some specific tasks. Consider the example of
an automated washing machine in which the process of washing clothes starts
automatically and continues for a specified time period.

 Technological convergence denotes merging of two or more existing
technologies to invent a completely new technology with multiple benefits.
 The term technological convergence gained popularity in the 20th century
with the emergence of computers, Internet and mobile phones.
 Let’s try to understand this concept with the help of an example.
 A smartphone combines formerly-separated technologies, such as voice, data and video
and make them operate on a single platform.
 In a smartphone, these technologies work as a shared resource and interrelate with
each other.
 This eliminates the need of using multiple devices; thus, instead of carrying separate
devices, such as a mobile phone, camera, pager and digital organizer, you can now use a
smartphone that assembles all these technologies.
Session 8: Convergence of Technologies

 The merger of computing, content and communications into a single system
is referred to as the 3Cs of technological convergence.
 The 3Cs of technological convergence are explained as follows:
 Computing: It refers to the design and construction of computers to perform various
types of tasks. An example of computing technology is the development of a software
program that allows people to work at home on the tasks assigned to them from their
job locations.
The 3Cs of Technological Convergence
 Content: It refers to any type of meaningful data or
information that is expressed through some
medium, such as speech, writing or images.
Content can be transmitted and shared through
diverse media, such as the Internet, television,
books, magazines and CDs.
 Communications: It refers to the interaction of
multiple computers over a network to share data,
information and other resources. Some examples
of communication technology include mobile
communication and Internet-based
communication technologies.

 Depending on the technologies involved, convergence can be of the
following types:
 Digital Convergence: It refers to the merger of the Internet, telecommunication and
leisure industries. Digital convergence enables you to convert various types of content,
such as text, voice, video, graphics, pictures, etc. into digital form, view multimedia
content and share it through different types of devices. The following figure shows a
digital convergence:
Types of Technological Convergence

 Messaging Convergence: It refers to the integration of text and voice messages. For
example, text SMS, voice SMS, Interactive Voice Response (IVR), Multimedia Messaging
Service (MMS), etc. Following figure shows a messaging convergence:
Types of Technological Convergence
 Media Convergence: Media convergence has
greatly impacted our daily life and even
transformed the way we perform our routine
activities. For example, earlier, we used a video
player to play videos, a tape recorder to play music
and an FM tuner to play radio.
 Content Convergence: It refers to the integration
of content from various sources on the Internet.
For example, various content media such as
advertising billboards, magazines, newspapers,
radio stations and television provide content on
specific Internet websites.

Pranavi verma-fundamental unit of computer

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