Audiovisualaidspt 120129005108-phpapp02

 “Audio

visual aids are any device which can
be used to make the learning experience
more concrete , more realistic and more
dynamic”
KINDAR . S. JAMES

 Audio

visual material should function as
integral part of educational programme
 Audio visual aids should be centralized under
specialized direction and leader ship
 Advisory committee should be appointed for
the selection and co-ordination of AV aids
 Instructors have to help the student how to
use AV aids
 Budget appropriation should be made
regularly
 Legal aspect should be considered

Opaque projector, built of large black
Consists two mirrors at top & bottom;1000w bulb
principle
Light rays passes through the first mirror, then to the
object, light rays from the illuminated picture then
focuses to the second mirror , then it is projected to
screen by using a convex lens
 operation :handle beneath the epidiascope is
lowered
then the picture want to project is placed on the
plate and handle is fixed again , then switch on light

 Helps

in retention
of material
 Attract attention
 Arouse interest
among the student
 Tests students
interesting

 It

is easily
breakable
 It should be
planned in
sequence

Magic lantern, used for projecting film strips
It contains condensing lenses to concentrate all
light into beam,500w bulb, smooth channel for
threading the film
Near the base of the channel there is knob which
carries a film strip, can be turned by hand to pull
the film strip through the projector
OPERATION : projector is placed on the table, as
face to the screen, insert one end of the film strip
in the knob (inverted position), film strip is
advanced by turning the knob
The blower and the lamp switched on; distance
between the projector and the screen is adjusted
to get the picture on the screen

 It

is an economical
visual material
 It is to make a
convenient to
handle and carry
 Takes up little
space and can be
eassily stored
 Logical sequence
to teaching

 The

equipment
used for is quite
expensive

OVER HEAD PROJECTOR
Vital teaching aid, replaces chalk board,
produces images behind and over the head
of the teacher
It consists metal box with 1000w bulb and a concave
reflector

vertical rod on the side of the box carries objective
convex lens and mirror which can be slows up and
down by using rock and pinion arrangement
Size of the sheet is 25cm *25 cm

STEPS IN USING OHP

Place the
OHP on
the table
facing to
screen

Put the
plug into
the
power
wall
socket
switch
on the
blower
first and
lamp

Move the
objective
lens and
mirror up
and
down to
get the
image on
the
screen

Explain the
material on the
transparency
with a small
pointer

•

•

•

•

•

Permits the teacher
pointing the material &
observe the student on
the same time
It can be used in fairly
lighted room
Materials projected can be
changed quickly and easily
Operation of OHP is
convenient
OHP can be used with
other type of AV aids




OHP is too costly
Writing by some type of
pen get blotted out on
plastic

Still picture gives illusion of space

Photographs are made by stereoscopic camera

Observer receives the impression of reality

Two photographs being taken from slightly different
angle which are enlarged and merged into one view

Micro film contains photographed reading material each
frame being reduced photo of printed page. It can be used
for the storage and retrieval of information. when micro
film is passed through microfilm reader, an enlarged image
is found on the on the screen

CARTOON
Metaphorical presentation of reality, humorous caricature
It is an interpretative which uses symbols to portray an
opinion , situation
Quality of drawing should be high
ADVANTAGES
Initiate certain lesson, motivate students to start a
discussion, make the lesson lively and interesting

COMIC STRIPS
Series of pictures
 very interesting in teaching stories, historical events, scientific
process
It enhances imagination , stimulate reality and involvement

CHARTS
Visual illustrative media for depicting the relation between
main idea and supporting facts
purposes of charts
 for showing relation by means of facts and figures
To show the continuity of process
For presenting abstract idea
For showing the development of structure
To stimulate thinking
HOW TO USE THE CHART EFFECTIVELY?

Types of chart
Narrative chart : narrating the idea and the facts
Cause and effective chart :relationship between rights and
responsibilities
Chain chart: expressing idea and facts in the form of cycles
Evolution chart: for expressing changes in specific item from
beginning
Strip tease chart : expressing information step by step. it has
Great suspense value, holding attention and building interest,
Increases interest and imagination of audience
Pull chart
Flow chart
Time or table chart
Job chart
Tree chart
Flip chart
Pie chart

FLASH CARDS
These are the sequence of cards which are presented before the
audience in proper sequence to till a complete story, size :25 *
30cm, it should contain picture or diagrams

PREPARATION OF FLASH CARD
cut full sheet chart paper into four equal parts
Height of the writing should be 5cm
It should hold in a way that the audience can see properly

ADVANTAGES OF FLASH CARDS
used to introduce and present the topic
Can be used to review a topic
Can be used to develop cognitive ability of recognition and
recall of students

GRAPHS
It depicts numerical or quantitative or statistical
data are presented in the form of visual symbols

TYPES OF GRAPHS
PIE GRAPH:

Data are presented through
the sectors of circle

BAR GRAPH
Category 4
Category 3
Series 3
Series 2
Series 1

Category 2
Category 1
0

2

4

6

A graphic presentation extends the scale horizontally along the
length of the bars

LINE GRAPH
6
5
4
3

Series 1
Series 2
Series 3

2
1
0
Category Category Category Category
1
2
3
4

Concepts are presented through the lines drawn either horizontally
Or vertically .The plotted points are connected each another

Pictorial graph
Pictures are used for expressing the idea ,more
attractive and easily understood. Vivid pictures are
used for depicting the information

chalk board
It is the life of the class room, helps to teacher in
explaining, illustrating, and giving notes to children. It can be
made of plastic, wood, cement or glass

types of chalk board
ORDINARY CHALK BOARD: it is movable and adjustable
And contains a wooden support
ROLLER TYPE: made of thick canvas, wrapped on a roller

Magnetic board: made up of steel on which magnet can
used to hold the objects

BLACK OR GREEN BLACK BOARD: framed with wood and
available on black or green color

Rules in using chalk board
Letters and drawing should be in large size and legible
Avoid spelling mistake
Writing should be in straight row
Do not use abbreviation
While writing on the board , the teacher should ensure
that the class is attentive

 Economical

teaching aid
 Captures student
attention
 It can be used
again and again

 It

makes the
student to heavily
depend on teacher
 Makes chalk
powder to inhaled
by teacher
 Constant use of
chalk board make
it smooth and full
of glare

Bulletin board
It can be used for educational and informational purpose. It is a
soft board which holds pins or tags and used for displaying
material

Principles in the use of bulletin board
A board for posting notices should be kept separate from
those for current events and study
Placement of bulletin board is to have one near the
administrator’s office , other near the library third on
conference hall, fourth one is in class room
Appearance should be neat orderly and attractive manner
Notices should be removed as they have fulfilled the purpose
Crowding of material should be avoided ,organized in
attractive manner
Bulletin board should be kept a little above the eye levels of
the average individuals

Flannel board
The rigid material covered with flannel cloth. The item to be displayed
are pictures, or drawing

Magnetic chalk board
A magnetic chalk board is framed iron sheet carrying porcelain
coating .Magnetic chalk board can used to write with chalk
stick , glass marking pencil, and to display pictures

3-Dimensional aids
Model
Models are the substitutes of real things . It can be made of clay, plaster of
Paris, thermacole cloth, wood etc

Types of model
Scale model: correct idea of an object can be displayed

Simplified model : gives a idea about external form of object
Working model : to demonstrate in a simple way of an operation
or process

Cross section model :inside of an object is visible

specimen
Part of a real object taken from natural setting.
It shows the quality of structure . Eg :section of
lung

Mock up
It emphasizes the functional relationship between device reality
and its workability. Certain elements of original reality is
emphasized to make it more meaning full eg :an artificial kidney
to demonstrate dialysis

moulage
It can be made up of plastic material to stimulate
life object

object
Brought from natural setting into class room that will
make the instruction more meaning full

RADIO
CHARACTERISTICS OF AUDIO EXPERIENCE
Immediacy : can describe the events as they happen
Emotional impact :through the combined effect of
music , voice , and environmental sound students
interest can captured
One way communication :no possibility of students
feed back

advantages
Recording can be stopped at will
Recording can play when we required
It can be used for introducing as well as summarizing the
topic
To evaluate the speech defect in ones own speech
To teach good pronunciation in foreign language

uses
It combines the sound and sight ,thus makes the experience
more concrete, real, and immediate
Offers uniformity in communication even the back bench
feels the pleasure of front row seat
It offers opportunity for seeing and listening
It can teach large number of students at a time
It provides excellent learning opportunity for both pre
service and inservice education of teachers
Helps to make the leisure time more interested

dramatization
Makes the class room instruction more lively
and interesting.
Student get the opportunity for participating
as well as in observing

Handling large
number of student
 Multi dimensional
learning through
works and graph
 The high storage
capacity of a
computer allows to
complete many
activity at a time


It lacks human and
emotional factor
 Computers are very
costly
 Problem in developing
language


Audiovisualaidspt 120129005108-phpapp02

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