4.1.1. Introduction:Audio Visual Ai

4.1.1. Introduction:
Audio Visual Aids are also called teaching materials. “Audio” literally means “hearing” and “Visual” is found by “seeing”. Therefore, all such aids, which make efforts to make the knowledge clear to us through our senses, are called “Audio Visual Aids” or “Teaching Material”. All learning materials which make the learning situation real can provide us with knowledge through the sense of hearing and of sight. Therefore, any equipment which can be used to make learning experience more concrete and effective, more motive and realistic can be considered as Audio Visual Aids.
We can study through our sense organs. Senses are the ways of understanding. All the senses help us get to know the environment. Most of knowledge we get from school go through our eyes and ears.
4.1.2. Definition:
Audio visual aids are “exactly defined as training or educational materials directed at both the sense of hearing and the sense of sight” such as “films, recordings, photographs, etc., used in classroom instruction, library collections or the like”.
“Audio-visual is, of course, a combination of two words: audio referring to that which we can hear, and visual referring to that which we can see. The basic frame of reference here limits our application of the term to a speaker and his audience, although they are not necessarily in the physical presence of one another, as in the case of a motion picture or television presentation” (Winslow Kelly and Thomas J.Serb, 1962, p.3).
The term "aids," used in reference to the speaker, rules out his physical presence (visual) and unrecorded voice (audio). These are the essential elements which make him a speaker, and therefore cannot aid him (his voice cannot aid his voice).
The aids themselves must be something either audible or visual, or both. The common types of audible aids are the spoken word, recognizable sound effects, and music. The most frequently used visual aids are people, pictures, cartoons, graphics, maps, the printed word, and three-dimensional models.
The audience, particularly a large one, can get a finer appreciation of details which cannot be enlarged in a suitable manner. However, the audience is left in a position to continue studying such material, both before and after the speaker refers to it, and thus he cannot "control" its use. We are left, then, with audio-visual aids which the speaker can control, and which are suitable for use with audiences of widely varying sizes.
4.1.3. Objectives
 To raise the teacher skills to make the teaching-learning process effective
 To help students to take the initiative in the classroom
 To communicate upon one’s capability
 To build a learning plan and create an interest
 To make students observe well
 To make learning documents easy and understandable
 To watch for a learning process of the students
 To contain some hints in objectives
 To create a concern among groups
 To make a teaching process more effective
4.1.4. Types:
They are simply categorized into three main groups, upon on experiment of senses because that human-being draws out their experience for them is mainly through contacting directly the objects.
a. Audio Aids: Radio, Tape-recorder, Gramophone, Cassette Audio, Lab room, Lingua phone.
b. Visual Aids: Chart, Black board, Maps, Pictures, Text-books, Slide projector, Flash cards, Prints, etc.
c. Audio Visual Aids: LCD project, Film projector, TV, Computers, VCD players, Virtual classroom, Multimedia, etc.
4.1.5. Disadvantages and Advantages:
a. Advantages:
 Help a learning process effectively
 Attract students’ attention
 Create students’ interests and teaching motivation in the learning process
 Increase students and teacher’s energy level
 Decrease a stress in the classroom
 Provide students with the realistic approaches and experience
b. Disadvantages:
 Technical problems
 Attention failure
 Expensive
 A waste time
 A need of space