Media audiovisual devices

PROJECTED AUDIOVISUALS TAPE A narrow strip or band especially magnetic tape that produces a tape recording. Other item associated with tapes are tape deck tape player, and tape recorder. NONPROJECTED GLOBE MAP MURAL OBJECTS (REALIA) POSTER AUDIOVISUALS Something spherical or rounded like a spherical representation of the earth, a celestial body, or the heavens. A representation usually on a flat surface of the whole or a part of an area; or something that represents with a clarity suggestive of a map. Relating to, or resembling a wall; or a mural is a work of art as in a painting that may be applied to and made integral with a wall or ceiling surface. Objects; that is, something material that may be perceived by the senses, or activities used to relate classroom teaching to the real life especially of peoples studied. A bill or placard that is decorative or pictorial for posting often in a public place Figure 2-13.—Media audiovisual devices—Continued. sometimes be included in the operations manuals that l Extension cords. You should use as short a cord come with certain types of equipment. In operating audiovisual equipment, you should become familiar with the necessary accessories and charts. Some of the most familiar accessories and charts are as follows: l Batteries. Generally alkaline or nickel-cadmium batteries are the best for audiovisual equipment. Rechargeable batteries cost more, but they last longer. Batteries come in a variety of sizes. Each is rated at 1 1/2 volts and can come in an assortment of different sizes, such as D, C, AA, and AAA. as possible, and you should use the right size wire. Always use a cord with a ground wire or adapter. l Lamps. Projection lamps have many characteristics-length, width, shape, wattage, base configuration, filament, location, and reflectors, to name a few. All lamps are designated by a code of three alphabetical letters such as DAK and ELH, which is the information you will need to have when you must replace a lamp. . Lens, screens, and distances. Projection distance is the distance from the projector to the screen. Lens length, given in inches, is written on the lens holder. Shorter lenses make larger images, and longer lenses 2-22