PPT On PROJECTED VISUAL AIDS

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PROJECTED VISUAL AIDS Presentation Transcript:
1.Presentation on Projected a/V aids

2.PROJECTED  VISUAL AIDS
Pictures  can be projected on a screen to supplement teaching

3.USES
Useful for larger group
To motivate the students
Arouse interest
To demonstrate skills

4.TYPES OF PROJECTORS
HARDWARE—
Slide projectors
Film strips cum slide projectors
Film strip projectors
Over head projectors
Opaque projectors
Film projectors
Computer

5.SOFTWARE---
Slides
Film strips over head transparencies
 Opaque material such as books objects
Films 16mm 8mm 35mm
  Power point presentation

6.SLIDE  PROJECTOR
SLIDE—
A small piece of transparent material on which
a single pictorial or scene is reproduced
Standard size of slide is 2×2or 4.5×4 inches
TYPES—
Photographic slides
Hand made slides
 Slide frames

7.ADVANTAGES
Slides are small in size ,so can be stored and carried around easily
Can be used repeatedly
Save  time
Easily handled ,stored and re-arrangedfor various uses.
Requires simple skills to operate

8.LIMITATIONS
Requires skills in photography or self making
Color processing is costly
Darkening facilities required for projecting ,it is difficult for students to write
Can get out of sequence and be projected incorrectly

9.FILM STRIPS
Series of Sequenced slides on a piece of film 
covering a large portion of a lesson
20—25 slides are there on an about half meter  to one and a half meter long film strip

10.TYPES
Discussional film  strips—
It consists of slides which has self explanatory titles .each strip may contain 25-100 pictures
Sound slide film—
In this type instead of explanatory titles spoken discussionis recorded which is audible and it is syncronized with pictures

11.OVER HEAD PROJECTORS
It is a versatile and popular device for projecting transparencies
Permits day light projection
Gives a bright image
Operator has complete control over the projections

12.OVER HEAD TRANSPARENCIES
Transparencies are readymade transparent acetate sheets  on which image can be seen through a visual projection .
The size of the transparency is 10×10cm.It can be as big as25×25cm.
The teacher can write with marker pen  that will be projected on the screen  or wall

13.ADVANTAGES
Permits face to face interaction with the students
Can be used in day light condition
Can present information  systematic developmental sequences
Simple to use with presentation rate can be controlled by the teacher
Requires limited planning and can be prepared in a variety of inexpensive methods
Use of overhead projector can be quite cheap as transparencies can be used repeatedly
Normally lighted room . The students can take down notes and the teacher facing the class can observe the students reactions and strengthen his presentation  

14.LIMITATIONS
Requires special equipment, facilities and skills for more advance preparation methods.
Overhead transparencies are large compared to other projected aids such as slides.
Projection lamps are costly.
Keystone effects can be there . When the lens of the projector is not parallel to the screen an optical distortion occurs resulting in broadening of the picture at the top and narrow at the bottom     

15.GUIDELINES FOR MAKING EFFECTIVE TRANSPARENCIES
Have one main idea on each transparency
Include only relevant figures and diagrams
Use simple lettering style in writing 
Use diagrames in proportion to its lettering
Keep the massege simple and clear
Emphasize the key masseges
Use colour and lettering with discretion.