WIS162 ELECTRICITY, AGRICULTURAL POWER 02/23/1990 03:44 PM D1 345 Lines Agriculture Mechanization/Engineering and Technical Support Services Electricity, Agricultural Power (30-45 days) This unit deals with electrical power as related to agriculture. Topics include career opportunities, electrical principles and terms, circuits and conductors, wiring, lighting, motors, three-phase power, electrical application, and safety measures. Objectives To acquaint students with employment information and career opportunities in the agricultural power industry To increase student understanding of electrical terminology and principles To demonstrate to students simple wiring and circuit layouts using tools, fixtures, and other equipment. To develop student understanding of power generation, transmission, and application To discuss with students safety measures when using or working with electricity Competencies At the conclusion of this unit, students will be able to explain current employment information such as job descriptions, job availability, personal and educational requirements, working conditions, opportunity for advancement, and other factors relative to potential employment in the agricultural power industry and relate it to their personal needs and aspirations; employ electrical principles and terminology in laboratory exercises; apply fundamental skills, procedures, and circuitry involved in electrical wiring; explain electrical safety measures and codes; apply electrical maintenance and simple wiring operations; identify electric motors, controls, and applications; and disconnect power before working on electrical circuits. Subject Matter (Basic skills integration areas are shown in brackets following title.) Careers - Current and future employment needs - Job descriptions - Training requirements - Working conditions - Opportunities for advancement - Other factors Electrical power significance [Mathematics, Social Studies] - Magnitude - Impact - Conservation - Electric usage calculations Principles of electricity [Science] - Conventional theory - Electron theory - Circuits Electrical terminology [Mathematics. Science] - Electrical terms - Ohms law and Watts law - Energy measurement Electrical safety - Underwriters' Laboratories (UL) label - Cords - Proper fuses, breakers, weather-proofing devices - Service safety - Grounding procedures - Ground Fault Circuit Interrupter (GFCI) - Stray voltage Generation, transmission, and sale of electrical power [Science] - Area generating plants - Types of generating plants - Transformers and transmission lines - Substations and distribution On-farm electrical distribution - Distribution lines and pole location - Farm transformers - Service drops Planning building circuitry - Demand - Code requirements - Design Conductors - Wire sizes - Wire capacities - Insulation types Identification and maintenance of boxes, switches, receptacles, fixtures, cords, and connectors Electrical installation tools and test equipment - Tool identification - Test lights and meters Wiring installation procedures - Nonmetallic cable - Armored cable wires - Conduit wires - Sheathed cable - Cutting, splicing, and connecting wires Lighting systems - Equipment operation - Layout and selection Electric motors [Mathematics, Science] - Principals of operation - Motor types - Fractional horse power motors - Large electric motors Motor applications [Mathematics, Science] - Selection - Protection - Drives - Motor maintenance Automatic controls [Science] - Switches and switch control circuits - Relay devices - Motor control devices - Automatic sensing devices Three-phase power [Mathematics, Science] - Obstacles in obtaining service - Advantages - Phase converters Static converter Rotary transformer Agricultural applications of electricity [Mathematics, Science] - Irrigation systems - Grain drying - Heat lamps - Heat cables - Water heating - Electric fences - Ventilation - Humidifiers - Dehumidifiers - Lighting systems Emergency generation of power - Tractor power take-off (PTO) driven units Alternators Generators - Self-contained engine-driven units (gasoline or diesel) Electric current only Combination generator/welder units Motivational Activities Take a field trip to local electric power plant. Invite an electrician to give a class presentation. Make use of identification display panels. Post bulletin board displays featuring topics related to this unit. View films, videotapes, and slides of unit topics. Learning Activities Participate in a Supervised Agricultural Experience program. Conduct an electrical use survey in the home or school. Do simple wiring in a model house skeleton. Participate in a safety inspection program. Dismantle simple motors and reassemble. Identify and calculate resistance of resistors, diodes, and capacitors. Instructional Materials Textbooks and References Agricultural Wiring Handbook. 7th ed. Columbia, MO: National Food and Energy Council, n.d. Electricity and Basic Electronics by Stephen R. Matt. South Holland, IL: Goodheart-Willcox, 1982. Exploring Electricity and Electronics by H. Gerrish and W. Dugger, Jr. rev. ed. South Holland, IL: Goodheart-Willcox, 1981. Fundamentals of Electricity: Basics of Electricity, Electronics, Controls and Computers by R.G. Seippel. 6th ed. Homewood, IL: American Technical Publishing, 1974. Fundamentals of Electricity for Agriculture by Robert J. Gustafson. New York: AVI Publishing, 1980. Practical Electrical Wiring by H.P. Richter. 14th ed. New York: McGraw-Hill, 1987. Using Electricity by J. Ronald Hamilton. 2nd ed. Englewood Cliffs, NJ: Prentice Hall, 1971. Wiring Simplified: Based on 1987 Code by H.P. Richter. 35th ed. St. Paul, MN: Park Publishing, 1986. Bulletins and Pamphlets The following are available from the American Association for Vocational Instruction Materials. Electrical Energy. 304. Electrical Wiring. Teacher Guide, 305TG. Student Workbook, 305SW. Electric Motors. 302. How Electric Motors Start and Run. 300. Understanding Electricity and Electrical Terms. 303. The following are available from the Cooperative Extension Service. Farm Lighting. AF2243 How to Use Electric Energy More Efficiently on the Farm. A2579 Reducing Home Lighting Expenses. E3100. Standby Electric Power Equipment for the Farm and Home. A2273 Stray Voltage Problems with Dairy Cows. NCR125. Wisconsin Farm Safety Inspection Report. A2374. The following are available from Hobar Publications. Agricultural Wiring Handbook. 574. Basic Electricity and Practical Wiring. 2377. Electrical and Basic Controls Used in Agriculture Production. 2277. The following are available from the Instructional Materials Service. Electric Motors - Lesson Plans for Agricultural Production. 4555. Controls and Control Circuits. 4549. Wiring and Safety. 4548. The following is available from the Ohio Agricultural Education Curriculum Materials Service. Demonstrations and Related Information for Teaching Electricity and Electrical Wiring. 720G. The following are available from Vocational Agriculture Services. Electrical Hazards in Home, Farm and Business. U3012a. Electrical Wiring Procedures. U3016a. Planning for Electrical Wiring. U3003b. Using Three-Phase Electrical Power on the Farm. U3038. Periodicals Computers and Electronics in Agriculture Power Engineering RE Magazine (formerly Rural Electrification Magazine) Computer Software The following are available from Hobar Publications. Basic Electronics and Related Review. Apple, IBM, TRS, Macintosh. Electric Motor Review. Apple, IBM, TRS, Macintosh. Electric Principles and Wiring Review. Apple, IBM TRS, Macintosh. Electrical Systems and Related Review. Apple, IBM, TRS, Macintosh. Ohm's Law: Series and Parallel Circuits. Apple. Practicing Ohm's Law, Power Law, and Resistor Circuits. Apple. Laboratory Resources The following is available from Interstate Printers and Publishers, Inc. Basic Electronic Identification Kit Films, Videotapes, and Slides The following is available from the American Association for Vocational Instruction Materials. Understanding Electricity and Electrical Terms. S303 (Slides) or AV303-2F (Filmstrip). 1986. The following are available from the Bureau of Audio Visual Instruction. Electric Circuits. 11324 (VHS videotape, color, 30 minutes). Annenberg/CPB Project, 1986. Electricity: The Way It Works. 00478 (16mm film, color, 16 minutes). Electric Letter, 1975. Our Invisible Friend...Electricity. 11720 (VHS videotape, color, 17 minutes). Film Communicators, 1985. Studying Electricity. 04857 (16mm film, color, 16 minutes). Journal Films, 1987. The following is available from the Media Resources Center. The R.E.A. Story. S58405F (16mm film, color, 28 minutes). United States Department of Agriculture, 1960. The following are available from Vocational Agriculture Services. Cleaning Electric Motors. 416 (46-frame filmstrip). Electric Motors 1 - Magnetism and DC Motor. F412a (34-frame filmstrip). Electric Motors 2 - Induction and AC Motor. F413a (36-frame filmstrip). Electric Motors 3 - Test, Connect, Reverse. 414a (39-frame filmstrip). Electric Motors 4 - Trouble Shooting. F415a (64-frame filmstrip). Identification of Electric Wiring Items. F404c (66-frame filmstrip).