PROJECTED AIDS

PROJECTED AIDS

                           Learning is the modification of behavior through experiences. The basic learning experience has to be received by the people through his séances, as they are the gateways to knowledge. Most of such experience enters through one’s eyes and ears. Materials that help to make learning experiences clear and vivid by appealing to these senses are called audio visual aids. The effective application of such aids is known as the audio visual technology.

                     Audio visual aids may be classification to projected aids, non projected aids and activity aids. A projected aid is one in which item to be observed are projected on a screen using mechanical devices. These aids are found to be very effective because movement can be added to sound and hence a realistic experience can be provided. The various projected aids are;

Ø Film and film projector

Ø Film straps and film step projector

Ø  Slides and slide projector

Ø Epidiascope and episcope

Ø Over head projector (OHP)

Ø Television

Ø LCD projector

Ø Computer

Ø Mobiles

Ø Tablets

Film and film projector

         They enrich learning by presenting a series or sequences of meaningful experiences involving motion. They can enlarge or reduce the actual size of objects to suit the need. They can transcend the barriers of time, complexity, and space and bring the past, present and probable future into the classroom. They give a sense of reality by enabling individuals to experience the outside world and make abstract and relationships concrete. Synchronizing the moving figures with sound makes the experience realistic and lively.

 Filmstrips and filmstrip projector

           A filmstrip is a piece of non-inflammable safety film, 35 mm wide. Its length may vary according to requirement and can be up to about one meter. One such strip may contain 10 to 50 picture frames. These pictures may constitute a connected series of drawings, photographs, diagrams or a combination of these and illustrate a single sequence, theme or incident. The picture may be in colour or in black and white. The filmstrips are projected by a filmstrip projector. Projecting filmstrips especially along with record commentary provide realistic and effective experience regarding a situation observed.

   Overhead projector (OHP)

           This is called overhead projector because it projects the image behind and over the head of the teacher. In overhead projection a transparent visual is placed on a horizontal platform platform at the top of the light source. The passes through the transparency and then is reflected at an angle on to the screen placed at the back of the teacher. The enlarged image will be much more effective. Moreover as the slide can be got ready earlier, time can be saved. The written matter will then get projected on the screen.

 Television

                          Television also can be considered as a projected aid. But projection is made at a central place, the T.V station. It is a very exciting and efficient means of mass communication. Educational television programmer aim at education rather than entertainment. These programmes can compensate for the scarcity of qualified teacher and lack of well equipped laboratories. A teacher or specialist can render teaching sessions and pass information to millions of viewers all over the world. Since the programmes are announced in advance, the institution can prepare the pupils to closely attend the telecast. Television can provide a variety of interesting learning experiences.

 Slides and slide projector

    Any picture or diagramed which will take a long time to be drawn on black board in the course of a class period can be developed as a slide. This can be got enlarged by projecting it on a screen with a slide projector.

    Slide projector I s an instrument equipped with a powerful light source and a carrier for holding slides of suitable size. The projector can also be operated and focused by remote controls. This aid is not only time saving but also helpful to add to the impression of the learning experience.

Episcope and epidiascope

 Episcope is used for projection of opaque objects. The principle of reflected projection is used in these pictures, photographs, drawings or any opaque material within the size of the platform of the episcope can be projected using this instrument.

          Epidiascope can project opaque as well as transparent objects. It is actually a combination of episcope and diascope. It is a sort of improved diascope. With the epidiascope, in the epi-position, flat opaque objects can be projected.

 LCD projector

          LCD projector is the most advanced and sophisticated projecting aid. It is used to present a topic in the classroom or in front of a large audience. We can demonstrate the real world situation and its simulation in the classroom in a theatre-like atmosphere. In the area of educational technology, we can replace all other projected and non projected aids with only a single LCD projector and a computer system. We can present a topic by using computer made slides, graphics, pictures, video clips, movies and special effects. We can bring the real world situation into the classroom by way of movies and multimedia effects.

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