TEACHER’S ROLE IN PROCURING AND MANAGING INSTRUCTIONAL AIDS

BY HARIOM GANGWAR MSC NURSING Ist YEARPSYCHIATRIC DEPART.

Educational Media Introduction : Audio-visual (AV) aids, or instructional aids, or audio-visual media,

communication technology, educational or instructional media, and learning resources are synonymous terms. Earlier, the term used was audio-visual aids; with the advancement in the means of communication and that of technology, educators coined these new terms.

The use of newer terms “educational technology” or “instructional technology” is primarily due to the dynamic expansion of programmed learning, computer assisted instruction (CAI) and educational television. Research effectiveness of AV aids in teaching–learning has been researched extensively and findings suggest that learning is directly proportional to the number of senses which are stimulated with the help of AV aids during teaching–learning process .

Introductioncont... If I hear I forget, I see I

remember, I do I learn —Chinese proverb

Once writing is equal to ten times reading; once teaching is equal to ten times writings — Unknown

Definition1. AV aids are “all material used in the

classroom or in other teaching situations, to facilitate the understanding of the written or spoken words” —Dent

2. “Audio visual aids are those devices by the use of which communication of ideas between persons and groups in various teaching and training situations is helped” —Edgar Dale

3. “Audio visual aids are any device which can be used to make the learning experience more concrete, more realistic and more dynamic” —Kinder S. James

4. “Audio visual aids are those sensory objects or images which initiate or stimulate and reinforce learning” —Burton

 PURPOSES OF AV AIDS Use of AV aids serves some important purposes in

teaching–learning process which are as follows - Clear images: clear images are formed when we see,

hear, touch, taste and smell as our experiences are direct, concrete and more or less permanent.

Antidote to the disease of verbal instructions: they help to reduce verbalism. They help in giving clear concepts, and thus help to bring accuracy in learning.

Vicarious experience: it has always been seen that the first-hand experience is the best type of educative experience. However, sometimess it is neither practicable nor desirable to provide such experience to pupils. Substituted experiences with the help of AV aids may be provided under such conditions.

 PURPOSES OF AV AIDSCONT...

Variety: more chalk or talk does not help. AV aids give variety and provide different tools to the teacher.

Helpful in attracting attention: it helps the teacher in providing proper environment for teaching and learning.

Conservation of energy and time: it saves a good deal of energy and time of both the teachers and students as most of the concepts and phenomena can be easily classified, understood and assimilated with the help of AV aids.

Realism: it provides a touch of reality to the learning situation.

 PURPOSES OF AV AIDSCONT...

Encouragement to healthy classroom interaction: it encourages healthy classroom interaction for effective realization of teaching–learning objectives.

Positive transfer of learning and training: it helps in the learning and solving of real-life problems by making possible and appropriate positive transfer of learning.

Best motivators: they are best motivators. The students work with more interest and zeal and are more attentive.

PRINCIPLES OF AV AIDS While using AV aids in the classroom, certain principles should be

kept in mind to enhance its effectiveness to facilitate learning- The teacher should be well prepared with the particular AV aid

which he or she is supposed to use with a particular lesson. For example, if a teacher is supposed to use transparency as an AV aid then he should prepare it in advance, systematically arrange the transparencies in order and keep it ready to use in the classroom.

Check in advance whether the slide/LCD/filmstrip projector is available in the classroom and is functioning.

Make sure that technical support is available whenever required. Selection of the AV aid should be as per the requirement of the

content to be presented to the students. Make sure that every student is able to see or hear the AV aid

without any difficulty.

PRINCIPLES OF AV AIDScont.. AV aid should be prepared as per the

prevailing guidelines for that particular aid and it should be attractive enough to draw the students’ attention.

As far as possible, students should be involved in preparation and preservation of AV aids.

AV aid should be economical. Principle of stimulus variation and feedback

reinforcement should also be considered while preparing and selecting an AV aid.

TEACHER’S ROLE IN PROCURING AND MANAGING INSTRUCTIONAL AIDS The teacher has to play a key role in storage,

borrowing, retrieval and monitoring of the use of AV aids. At the college level, a nursing faculty can manage these aids in AV aids room which is an essential part of a college of nursing as per Indian nursing council norms.

Models and charts can be permanently installed on the walls in the particular classroom in which they are supposed to be used; for example, anatomical models charts can be placed in first-year classroom. Similarly, models of pelvis and fetus can be placed in final-year B. Sc classroom.

Characteristics of Good AV Aid

cont...

AV aids can be borrowed or purchased from outside agencies, if available. The teacher has to be knowledgeable about these agencies and departments. Some of the sources of AV aids are as follows.

Educational agencies (NCERT). Professional organizations. Non-governmental organizations. Voluntary organizations. Commercial producers (Pearson Publication,

Lippincott's Ovid SP etc.).

TYPES OF AV AIDS

AV aids can be categorized into three broad categories, that is, audio aids, visual aids and audio-visual aids. These categories can be further classified as listed in Table -

TYPES OF AV AIDScont..

I. Visual Aids (Non-Projected)

1. Blackboard or Green Board-

The blackboard or green board is the commonest and oldest visual aid used for teaching. It is so commonly used that it has become a compulsory part of a classroom. Guidelines for the effective use of blackboard in a classroom are as follows.

Make sure that board is clean before starting the class; erase any material as it will distract the students.

Divide the board into two equal halves and start writing from the first half of the board; when it is full, continue writing on the second half; when the second half of the board is full, then erase the first half and so on . This writing and erasing sequence will not interrupt the students from taking notes from the blackboard.

Write only the key points that make the skeleton of your lesson. Don’t overcrowd the board with too much written content on it.

Develop the concepts of your lesson on the board as you progress through your lesson.

Blackboard or Green Board- cont... The size of the written letters on the blackboard should be large

enough so that every student can read it. Ensure their legibility from the last row before the lecture.

Use white or yellow colour chalk for writing on the board as other colors may not be clearly visible to the back-row students.

It is better to write in bold letters because thin letters are difficult to read.

Use sufficient pressure while writing on board. Avoid writing on those areas of the board which may not be

visible to all students, such as the sides and the bottom of the board.

Switch on the light above the board to ensure good visibility of the board. Avoid direct glare on the board.

Avoid speaking while writing on the board. Use coloured chalks to highlight or differentiate. Stand clear of the written word. Don’t show your back for a prolonged time while writing on the

blackboard. Clean it completely after the class is over.

Blackboard or Green Board- cont...Proper use of blackboard-

Blackboard or Green Board- cont... Advantages of the Blackboard

1. Easy to use.2. Electricity is not a necessity for its usage.3. Cheap and readily available in most of the

classrooms.

Disadvantages of the Blackboard

4. Requires good calligraphy skills to use it effectively.5. The written material cannot be stored and reused.6. If good quality chalk is not used it may make your

clothes and hands dirty

2. Flannel Board A flannel board is simply a board covered with flannel

which is a soft cloth that is made of cotton or wool. Flannel board can be used as a visual aid as it facilitates placement of shapes, symbols, and cut outs on it. It helps the students in comprehension by its attractiveness and stimulating material presented on it, also it brings out creativity and interest among students. It can serve as an effective visual aid for smaller group of students.

The board is covered with felt or heavy flannel that will provide a background base for cut outs or shapes. Black and light-blue colours are considered to be better for flannel board.

2. Flannel Boardcont.. Advantages

1. Provides a scope for creativity and originality.2. Students are more attracted and learn the content on the

board with interest.3. Contents of the board can be preserved for a long time

and can be reused.

Disadvantages

4. It is time consuming to prepare the content to be displayed on the flannel board.

5. Materials have to be adapted to make it useful for flannel board.

3. Bulletin Board It is the board on which current news, study material and

quizzes etc., can be displayed by the students .It is a visual aid which stimulates the students to prepare and display interesting learning material for the class.

It provides a unique teaching–learning experience to the students and results in active learning as students are responsible for preparing and displaying the learning material on the board. The teacher must delegate the responsibility to the head student to regularly check and maintain the bulletin board.

A teacher can also use it in a classroom to display illustration, steps of a process, photographs, newspaper cuttings relevant to the lesson content and any other creative work to enhance student learning. 

3. Bulletin Boardcont..

3. Bulletin Boardcont.. Guidelines for Effective Use of Bulletin Board

I. A bulletin board should be installed at a well-lit place.II. Neutral colour should be used as background color of the

bulletin board.III. It should not be over crowded, else it will lose its

attractiveness.IV. Items should be displayed creatively, systematically and

logically which will create an appeal and attract attention of the students.

V. A suitable title should be given to each group of items placed on the board.

VI. Replace the items after a period of time with newer ones.

3. Bulletin Boardcont.. Advantages

1. Cheap and effective visual aid, if used properly.

2. Material displayed on the board can be stored in files and reused whenever required.

3. Stimulates the student to search for or prepare creative work to display on board.

4. Useful aid to display various announcements and classroom rules.

4. Flash Cards Flash card, as the name indicates, is a card which is made of

hard or compact paper of varying size on which brief content or illustration is displayed. A series of cards are sequentially arranged and flashed one by one for a few seconds in front of a small group of students to depict a concept or step of process or list of clinical manifestations of a disease, which attracts the students’ attention and enriches their learning experience.

The teacher should hold the card on the chest or use a folding case to show the card one by one to the students while making sure that each student is able to see the card. The teacher should provide running commentary of the content while showing the card. Ten to twelve cards for one talk can be used. The messages on the card should be simple and brief line drawings or photographs, etc..

4. Flash Cardscont... .... In nursing education flash cards are frequently used in the

clinical setting during case presentation, drug presentation or during planned health teaching. However, it can also be used in classroom teaching, provided that the size of the group is small.

Advantages of Flash Cards1. Easy to prepare and use.2. Portable, so can be used whenever required.3. Effective aid to teach a complex process.

Disadvantages4. Cannot be used for larger group of students because the size

of card is not large enough to be seen by all students.5. Time consuming to prepare the cards.

5. Flip Chart It is made of compact sheets or large pads of papers which

may include picture maps, cartoons, handmade diagrams and photographs, etc.

A flip chart is used as a visual aid in which information is provided in sequence with the help of clipped compact sheets which are arranged in sequence, and each paper sheet is flipped up after it has been shown to students.

6. Poster Posters are a widely used visual aid to communicate

messages to the mass. A poster should be dramatic to attract attention of the target group with any prominent or central feature standing out sharply.

6. Postercont.. You might have seen posters of pulse polio program; can you

recall what the message in that poster was? Was it too long or too short? It was a short easily communicable message “do boond zindagi ki”.

It is noteworthy that many students wrongly consider poster and

chart as synonyms. Posters are usually used for communication with very large groups and the message on it is short and crisp while charts rare used for small groups with slightly more content written in technically complex language on it. A poster is usually prepared on a very large size tuff sheet and is displayed at a well-lit place where most of the students or the target group can see it.

A lot of creativity and imagination is required to prepare a good poster.

One picture is worth a thousand words: Chinese Proverb

6. Postercont..

Advantages

1. Effective mean to communicate with large groups of people.2. Attracts attention of the audience.3. Does not require detailed study of the topic to prepare a

good poster.4. Relatively cheap and easy to use.

Disadvantages

5. It does not communicate enough information.6. May become ineffective when it becomes part of the routine

environment.7. Time consuming and requires a lot of creative work and

imagination to prepare a good poster.

7. Charts Charts are an effective and simple visual aid frequently used by nursing

students and teachers to explain steps of a process, a concept or for comparison of two contrasting ideas that are too complex to explain in words alone .

Similarly, a teacher can draw some pictorial on a chart to facilitate

learning of a difficult concept. The one difference between a chart and a poster is that while using the chart, the teacher has to explain the content which is written or drawn on it in technical language; in contrast, in the poster the message is clear and concise and self explanatory.

Guideline to Prepare Charts Select a good quality chart of appropriate size (20″ × 30″ or 30″ × 40″)

and type (table chart, wall chart, flow chart) as per the requirement. Do not use a number of different color shades unless it is a must.

7. Chartscont... Give a clear and concise heading to the chart which describes

what the chart is meant to depict. For example, “Clinical manifestations of congestive heart failure”, “Pathophysiology of MI”. The heading should be written in sufficiently large size letters that is eye-catching.

Prepare a dark or light background as per your requirement and accordingly select the colour of text and other material which will be presented on the chart.

Use imagination and creativity to provide good color combinations in the chart while depicting contents or pictorial material. Contents should be arranged systematically.

Enhance the esthetic look of the chart by systematically presenting information on it.

Display the chart at a well-lit place and at appropriate height and distance from where students can see it easily.

7. Chartscont... Advantages

Easy to prepare and handle. It is portable, therefore can be used in any setting for a small

group of students. It is not costly, hence can be used widely to explain

comparison, process, and sequence of events. Can be reused when required. Easy to store. Disadvantages

Useful to teach only small group of students, not for large groups.

May not attract students’ attention if it is not carefully planned, designed and is jumbled with information.

8. Graphs Graphs are visual aids that are most commonly used to

present statistical data as well as the trends of certain characteristics. Undergraduate and postgraduate nursing students use this aid to present their research findings before research committees.

There are certain types of graphs that can be used to depict a group of data.

Pie Graph It is also known as circle diagram. The data are presented

thorough the sections of a circle. The total frequencies or value is equated to 360 degrees and then the angles for the corresponding components are calculated. After determining their angle, the required sectors are drawn in the circle (Figure next).

Pie Chart Showing Percentage Distribution of Students in Various Nursing Programs in Punjab

Bar Graph

Horizontal or vertical bars are used to represent the data in this type of graph. Before constructing bars, scale is prepared according to the type of data, which determines the length of bars. Equal spacing is necessary between two consecutive bars. There is a wide variety of types of bar graphs which you can explore in Microsoft excel utility (Figure ..

Line Graph

Line graphs are used to show trends or relationship between two or more variables. Quantitative data are plotted as dots in between horizontal and vertical axis and the dots are connected with a line which makes a curve (Figure ..Figure - Line Graph of Rank Order of First 10 Risk Factors of Fall Among Older Persons

Pictorial Graph

In this type of graph pictures are used to express a given idea. They are more attractive and easily understood.

Figure - Doughnut Graph Showing Percentage of Students in Various Nursing Programs in Punjab

9. Cartoon

A cartoon is humorous caricature which gives an obvious message indirectly. It involves the features of objects and people which are embroidered along with some general symbols.

The drawing in a cartoon should be simple and easily understandable.

The symbols used should be familiar and represent a concept or idea to which students can react intellectually.

II. Visual Aid (Three Dimensional)

1. Objects

An object is a three-dimensional visual aid. It is a sample of a real thing, which is visible and tangible to the students. For example, a syringe, thermometer, Swan–Ganz catheter and stethoscope are objects.

The object can be used as a real visual teaching aid to explain the various parts or the structure and its proper use. Students become excited and attentive when they see the sample of a real thing, which leads to permanent learning about the focused instrument, item or material. Sometimes, it is difficult to present the real object in the classroom because of some constraining factors, for example, the object is costly, inaccessible and fragile. In this situation it is better to use a replica instead of the real object.

Replica: It is the exact copy of the real object. The size, shape and feel of the replica are the same as the real object. For example, fetus dummy, pelvis, skeleton system, etc.

Facsimile: It is the same as a fax. It is the true copy or duplicate of the written or printed document.

2. Dioramas

A diorama is a three-dimensional arrangement of an object, like cut outs or models, to illustrate a central idea, theme or concept. These objects and models are arranged in a show case which is like a big box with a glass covering and background printed with a shade or a scene.

It is an effective AV aid to teach the appearance of actual things which are impossible to bring to the class room. It also provides opportunity to show live things in the classroom, e.g., an aquarium. The major disadvantage of dioramas is that it is costly to prepare and sometimes it may communicate false information to the students if it is not a replica of the actual thing.

3. Specimen

A specimen is a three-dimensional visual aid which is most commonly used in teaching of anatomy, zoology and botany. It is a representative of the whole thing. For example, a specimen of human lung or heart is representative of all human lungs or hearts in terms of structure and function, hence can be used for the study of the human lung or heart. Likewise, a handful of black gram or rice or wheat is representative of their grain species and can be used for the study of the same.

Advantages

Specimens provide first-hand information to the students, hence they are an effective visual aid widely used in study of anatomy.

Disadvantages

Very costly teaching aid as it requires organ donation to get a specimen in an anatomy lab.

Difficult and costly to preserve and store the specimen

4. Models

Models are three-dimensional (height, width and depth) visual aids which are not same in size, shape or function of the real object. Although models are not the same in size and shape or other physical parameters to the real objects, still they imitate the real object, and hence can be used as effective visual aids. Models are more creative and attractive, and therefore catch the eye of the students easily.

In nursing sciences models are most frequently used to teach the physical setup of an institution, for example, water sanitation plant, hospital, cath lab etc., or to teach structures of various body organs, for example, model of heart, lung, kidney etc., or to teach a procedure, for example, model of three-bottle water-seal drainage system.

Advantages It is a useful visual aid for small as well as large group sizes. Models can be used to reduce very large objects and enlarge very small

objects to a size that can be conveniently observed by the students. It can be helpful to teach anatomy, nursing procedures and physical setup of

various departments in a hospital.

4. Modelscont..

Help to stimulate reality when it is not possible to access the real object or replica.

Models are useful for demonstrating the interior structures of objects or systems with a clarity that is often not possible with two-dimensional representations.

Models can be stored and reused whenever required.

Disadvantages

Can convey wrong information to the students if not prepared carefully.

Costly and time consuming to prepare good models. Require a lot of space and caution to store the model.

5. Puppets

Puppets have been used as a visual aid for teaching in India and China for the last 4000 years. Puppets are an inanimate object used in the art of puppetry, popularly known as “Kathputli” in India. It is a three-dimensional AV aid usually made of wood but any other material can be also be used to prepare it.

A puppet enacts a particular character in a puppetry show, which can be planned to teach some principles, attitude toward specific health-related issues like HIV/AIDS and contraception in specific communities. History of nursing and changing trends in nursing education can also be taught with the use of puppets. It requires a well-written script to make the teaching effective and interesting. Students learn by viewing the performance of the puppets during the show as well as by making the puppets, and acting as puppeteers.

Puppets can be of various types; for example, hand/glove puppet, string puppet, rod puppet, shadow puppet. String puppets are very popular in north-west part of India while rod and shadow puppets are common in southern India.

5. Puppetscont..

Advantages

Students learn by doing (making puppets, script writing, and organizing puppet shows).

Puppets can be stored and reused. Puppet play provides the opportunity to the students

to get comfortable in situations that are unfamiliar or challenging.

Disadvantages

Time consuming and difficult to make good puppets. Requires special training to become good puppeteers.

III. Visual Aid (Printed)

1. Leaflets Printed material, which includes leaflets, pamphlets and magazines are the major

means of conveying propaganda. Leaflets were initially used in military settings to communicate a message rapidly among soldiers.

A leaflet is a written or pictorial message on a single sheet of paper that is printed on

both sides and folded in half, in thirds, or in fourths; however, it has no standard size, shape, or format. While selecting the size, shape and weight of the paper, the primary consideration is that the paper accommodates the message and be easy to distribute. The most commonly recommended size of leaflet is 6″×3″. The major factors which affect the leaflet sizes are the length of message, artwork required, and the purpose of the leaflet. A properly developed and designed message on a leaflet can have a deep and lasting effect on the learner, and hence it is commonly used as an effective AV aid in a teaching–learning situation.

Guidelines for Making Effective Leaflets

The teacher must persuade the students with the reasonableness of the message so that the reader will be motivated either to pass it on to others or to relay the message by word of mouth.

1. Leafletscont...

The heading of the leaflet must be brief, summarizing the theme by using short and effective words.

To gain the interest of a target audience within the first few words, the first sentence of the text should contain the essence of the message.

While using pictures in leaflets the picture and the text must complement each other.

Advantages

A leaflet can be passed from student to student without distorting the information on it.

It allows for the use of photographs and graphic illustrations which can be easily understood by all level of students.

It is permanent and can be stored and retrieved whenever required. It can be useful to communicate messages for a very large as well as

small group of students. It reinforces learning by providing chances of rereading as and when

required by the students

Leafletscont...

Disadvantages

Dissemination of the leaflet is time consuming and costly. It is less timely than other means of communication. It can be altered by overprinting. Development and design of effective printed material requires trained and knowledgeable

personnel.

2. Pamphlet The pamphlet has been used for centuries as an economical AV aid for broad

distribution of information. A pamphlet is a booklet which is unbound or without a hard cover. It typically consists of a few pages that are folded in half and saddle stapled at the crease to make a simple book. In order to count as a pamphlet, UNESCO requires a publication to have at least 5 but not more than 48 pages, exclusive of the cover pages; a longer item is a book.

Pamphlets can contain anything from information on emergency management of heart attack to the steps of basic life support, warning signs of cancer and warning signs of stroke etc. It may also describe particular drugs, steps of some emergency conditions which will help the students to learn by providing them rapid access to the material as and when required.

IV. Visual Aids (Projected) 1. Overhead Projector

Overhead projector (OHP) is one of the most frequently used visual aid in nursing education which has replaced the blackboard in most of the classrooms. As the name indicates, it is a projecting device that is made of a lamp, lens and mirror arrangement which projects material, which is written or drawn on a transparent plastic sheet (transparency), on a screen (Figure )

The size of the plastic sheet is usually 25 × 20 cm. Although it is not a sophisticated instrument like the data projector but it still requires some guidelines to be followed to make it an effective teaching aid.

Guidelines for Overhead Projector

Make sure that every student in the class can see the screen easily without any obstacle. The OHP should be set up for optimum image size and focused before the class starts.

The stage of OHP where the transparency is placed should be clean so that it will not obscure the images of the transparency.

Overhead Projectorcont...

Overhead Projectorcont...

Follow the general rule of one idea-one transparency.

The transparency must be covered with a opaque sheet while putting it on the OHP stage then progressively disclose one point at a time.

While using a transparency don’t talk to the screen, but talk to the students and use a pointer on the OHP stage to point out on the transparency.

Be creative while preparing a transparency; for example, to build up a complex diagram three or four transparencies can be used as overlays on the original transparency or you may employ cutouts to build visuals in stages.

Radiographs can be projected successfully with the overhead projector. For this purpose, the classroom must be darkened.

Switch off the projector light when you are not using the OHP because the bright screen will distract the students and also it is not good for the health of the OHP (projector may overheat).

Black, blue and green colors are considered good for transparency preparation. Avoid yellow, orange and red (not projected well by OHP).

Overhead Projectorcont...

Not necessary to write text content in running CAPITAL LETTERS.

Write in legible letters.

While preparing transparencies, follow the rule of seven or eight lines per transparency and seven or eight words per line.

Advantages of the Transparency

Transparencies can be prepared well in advance and can be stored and reused whenever required.

Progressive disclosure of a transparency is helpful to gradually build up the concept under study.

Material can be prepared by the teachers themselves.

It is a time-saving and cost-effective visual aid.

Disadvantages of the Transparency

Novice teachers may feel difficulty in proper use of transparency.

Overhead Projectorcont...

Creativity and imagination is required to make good transparency.

Students may read on the transparency if the teacher exposed it entirely in the beginning, creating disharmony in what the teacher is teaching and what the student is reading.

Difficult to handle and preserve the transparency.

Electricity is a must for its use.

Teachers usually tend to talk to the screen instead of students.

Inappropriate teacher's position may cause difficulty in watching the transparency.

Printed transparencies which teachers use because of lack of time to prepare a transparency cannot be considered as good approach.

Students require notes or handouts if class is taken with the help of transparency because most of their time is spent in reading the transparency.

Not useful for students with visual impairment and dyslexia.

2. Slides A slide is a small piece of transparent material on which a single graphical image is

placed or photographed. Slides are an important visual aid which is commonly used to provide high-quality images to the learner with the help of a slide projector. It projects still images in sequence on the screen which enriches the learning experience of the students. Slide projectors and filmstrip projectors are AV devices which are used to project slides and filmstrips on the screen.

Slides are small-format photographic transparencies in color or black and white which are projected with the help of slide projectors. On the other hand, filmstrip projectors project images contained in filmstrips, which are a series of small slides photographed in permanent sequence on a 35mm or 16mm film, either in color or in black and white.

Each film strip usually contains 12 to 18 films in a sequence. They are less expensive, easily handled and can be stored for future use. They are adaptable for use in every subject area. There are two types of slides which are as follows.

Photographic slides: they may be black and white or colored. The size may vary between 2″ × 2″ and 3″ × 4″.

Handmade slides: this type of slides can be made by using different types of materials (acetate sheets, cellophane, etched glass etc.).

Advantages

Attracts the attention of the students.

Slides cont...

Makes learning easy.

It is a portable visual aid, can be used in variety of settings.

Disadvantages

It is a costly visual aid.

Handling of the slide and slide projector is difficult.

V. Audio Aids 1. Public Address System Public address (PA) systems consist of a microphone or input source, a mixer

amplifier and one or more loudspeakers to convert electrical signals into sound. Simple PA systems of this type often provide 50 to 200 watts of power and are often used in small venues such as college auditoriums, lecture theater and big classrooms to make teacher's voice audible to the students. A sound source, such as a computer, may be connected to a PA system so that audio or video can be played through the system.

PA systems with a larger number of speakers are widely used in institutional and commercial buildings, to read announcements or declare states of emergency. Intercom systems which are often used in schools also have microphones in each room to send replies to the central office.

2. Radio A radio is an auditory aid which is used to present teaching material in the

form of voice only. Its primary purpose is to entertain public but it can be exploited as a teaching aid. The broadcasting of radio programs is done by “Akashwani” center, which reaches the public direct in their homes.

As a teaching aid it can supplement classroom teaching and may be useful in improving pronunciation and language of the students.

3. Tape Recorder

A tape recorder is a portable electronic device that can play pre-recorded sound as well as record

the sound on a magnetic tape. It provides functions to play, forward, rewind and pause a particular tape. It can be used to teach verbal communication skills and counseling skills to the nursing students. Nowadays, CD and DVD players have replaced the traditional tape recorder, as they are more convenient and have a large storing capacity on a single CD-ROM or DVD-ROM.

VI.  Audio Visual Aids

1. Multimedia When two or more different types of media are used sequentially in a single instruction or for self-

paced learning package, the term multimedia is used. Using multimedia or multi-image, a large amount of information can be passed across to students, and high interest can be created in students. Furthermore, different media can be tailored towards different objectives outlined for the lesson.

2. LCD Projector

LCD projector is the latest technological innovation which has revolutionized the world of AV aids. It is a versatile teaching aid (multimedia) which is useful in almost all educational disciplines. Content is projected with the help of a LCD projector, which can project everything on the screen, whether it is 

LCD Projectorcont..

LCD Projectorcont..

Advantages

Attracts the attention of the students. Makes learning easy. Can use a variety of presentation modes.

Disadvantages

It is costly and sophisticated equipment. Requires careful handling. It is not a portable device.

3. PowerPoint Slides

PowerPoint is a utility of Microsoft office which can provide high quality, high-tech delivery of teaching materials through the use of slides on a computer screen (Figure ). Being a versatile AV aid it can incorporate anything, like pictures, audio, video, animation, text, graphs etc. on the slides, thereby increasing the student interest and attention through stimulus variation.

PowerPoint Slidescont..

PowerPoint Slidescont..

Guidelines to Make Effective PowerPoint Slides and Presentation

Choose dark or light background of the slides as per your requirement.

Select dark color font if your background is light and vice versa.

Choose an appropriate layout for each slide as per the requirement (comparison, picture, video, audio layout slide).

Projected text should be large enough so that everybody in the classroom can see it without any difficulty. Ideally, headline font size should be 36–44 font size and rest of the text should be in 32–36 font size. It should never be less than 24 font size. Select Sans Serif font type as it is considered best for PowerPoint presentations. All CAPITALIZED letters are difficult to read and should be avoided.

Use images to emphasize a particular point or concept but it should never be used just to occupy free space on the slide. Images must be relevant to the content of the slide, otherwise it may distract the students.

Use simple animation whenever necessary, it is better to use it sparingly.

Follow the rule of eight (eight lines in each slide, eight words in each line.)

PowerPoint Slidescont..

Disadvantages

It easily becomes a replacement for the presenter, not reinforcement. More chances of misuse; presenter may just read on from slides, spoiling the purpose of the AV

aid. The teacher may dare to take a class without enough preparation by putting all the content

material on the slides and just reading from it in the classroom.

Advantages of PowerPoint

Greater flexibility in selection of slides and illustration of teaching points. Picture quality can be improved and pictures can also be edited as per requirement. Safe, clean and minimal storage space required. Textual information can be copied and retrieved any time and can be converted into hard copy. Capable to provide maximum stimulus variation, e.g., photographs interspersed with models

and data, audio, video and animation etc. Cartoon slides or fun slides can serve an educational purpose as well as lighten the teaching–

learning environment. Maintain a high level of interest in the lesson.

Promote greater student participation.

Can be used at all levels of learning.

It is time-intensive to create PowerPoint slides but it is an investment which can easily be updated and reused once teaching and learning patterns develop.

4. Films

Films are AV aids which communicate through sound and sight simultaneously. It blends pictures, colors, objects and graphs to suits its purpose. It may be fixed filmstrips or slides, and motion picture films.

Types of Films

There are many types of films which are available commercially but the following types are more frequently used as teaching aids.

Instructional films: it pertains to specific instructional subjects and the duration of a film is usually 10–20 minutes. Films division of government of India in cooperation with ministry of education has produced many instructional films on different subjects.

Documentary films: it presents actual truthful material in a cinematically interesting way.

Discursive films: a topic or series of related topics are presented in a systematic, logical way through this type of films.

Drill films: useful to teach disaster drills to nursing students.

4. Filmscont..

Advantages

Direct the attention of the whole class to the screen and to the pictures and words on it.

Can depict the situations which the teacher cannot present in the class room.

It can be shown over and over again if required.

Attracts high degree of attention of the students, and hence can teach a large content material in short time.

Motion pictures are able to communicate emotional experience and attitude.

Disadvantages

Films are costly.

Trained staff is needed which is generally not available.

It is difficult to discuss important points during the projection of a film.

5. Television

Television is considered as the electronic blackboard of modern society as well as a medium of

mass communication. It activates the sense of hearing and vision, and hence results in better learning. It attracts the students and creates interest and desire to learn among students.

Advancement in technology has changed the size and shape of television, refining its quality as an educational media. Television can be used to show video, seminars, demonstrations and lectures from an expert who is otherwise inaccessible in the classroom. Its use as an AV aid is versatile and is considered very important in nursing education. It is a boon for distance education as it broadcasts a number of educational programs through satellite into the homes of students.

Advantages

Can be used for large group of students.

Saves the time of teacher and is an economical device.

Reduces teacher's workload.

Disadvantages

Requires electricity for operation.

Requires maintenance as well as a suitable place for installation.

Various AV Aids Arranged in a Classroom

Reference

file:///C:/Users/harry%20patel/Desktop/CHAPTER%208%20-%20EDUCATIONAL%20MEDIA%20-%20Communication%20and%20Nursing%20Education.html

http://www.slideshare.net/SaimaSam/role-of-media-in-education

https://avaudiovisualaids.blogspot.in/2010/10/av-aids-in-teaching.html

THANK YOU