1. AUDIO VISUAL AIDS DEFINITION.
1.Burton : AV aids are those sensory objects or images which initiate or stimulate and reinforce learning.
2.Good’s Dictionary of education : AV aids are anything by means of which learning process may be encouraged or carried on through the sense of hearing or sense of sight.

2. POPULAR SAYINGS ON AV AIDS
I hear , I forget
I see , I remember
I do , I understand

3. People generally remember
10 percent of what they READ.
20 percent of what they HEAR.
30 percent of what they SEE.
50 percent of what they HEAR AND SEE.
70 percent of what they SAY.
90 percent of what they SAY as they Do a thing.

4. Senses are the gate ways of knowledge
Research done by cobun (1968) indicated that;
1 percent of what is learned is from the sense of TASTE.
1.5 percent of what is learned is from the sense of TOUCH.
3.5 percent of what is learned is from the sense of SMELL.
3.5 percent of what is learned is from the sense of
HEARING.
83 percent of what is learned is from the sense of SIGHT.

5. Important values of AVaids:-
Best motivators.
Help to reduce verbalism-help in giving clear concepts and then help to bring accuracy in lging.
Clear images:
Vicarious experiences:
Variety.
Freedom to use.

6. Opportunities to handle and manipulate.
Retentivity
Based on maxims of teaching.
Helpful in attracting attention.
Saving of energy and time.
Realism.

7. Vividness.
Meeting individual differences.
Encouragement to healthy classroom interaction.
Spread of education on a mass scale.
Promotion of scientific temper.
Reinforcement to learners.

8. PRINCIPLES IN THE USE OF TEACHING AIDS 1 1.Principle of selection
Positive transfer of learning and training.
Positive environment for creative discipline.
PRINCIPLES IN THE USE OF TEACHING AIDS 1
1.Principle of selection
2.Principle of preparation.
3.Principle of physical control.
4.Principle of proper presentation.
5.Principle of response.
6.Principle of evaluation.

9. CLASSIFICATION OF TEACHING AIDS
Non- Projected Aids
Projected aids
Graphic aids
Display boards
3-D aids
Audio aids
Activity aids
Film strip
1. Charts
1. BB
1. Models
1.Radio
1. Field trip
2.OHP
2. Cartoon
2. Bulletin
2. specimen
2. Tape recorder
2. Demonstration
3. slides
3. Diagram
3. Flannel
3. Mock-ups
3. CAI
4. Flash card
4. P.INSTN
5. Graphs
5. Dramatics