|How execute We convert Electrical energy Into mechanically Energy?|
GRADE LEVELGrades 9 through 12
ESTIMATED TIMEThis lesson arrangement will take around 50 minutes.
CONCEPTAccording to the law of conservation of Energy, we cannot develop or destroy energy, however we can change its form. That method we can transmit energy good distances in that electrical type and, when it arrives at that is destination, readjust it into its mechanical kind to carry out work.
BACKGROUNDThe many common an equipment for transforming electrical energy into mechanical power is the motor. Most motors usage electromagnets to cause mechanical rotation, which deserve to do work. Prior to Nikola Tesla created the AC (alternating current) induction motor, no electric motors could adjust AC right into mechanical energy. The most fundamental element the the AC engine is the electromagnet, a magnet made from electric current. In the first Demonstration Experiment below, you have the right to make and demonstrate one electromagnet to present students the many basic method of transforming electrical power into mechanically energy.
LESSON OBJECTIVESStudents will:Discuss the idea that as mechanical power was converted into electric energy at the strength plant, electrical energy is currently to it is in converted back to mechanical energy by a motor.Make some an easy drawings of just how magnets job-related in the operation of a motor. Discuss the use of the engine in industry and also how other applications that the motor could work.
NATIONAL STANDARDSThis lesson addresses the following National Science education and learning Standards, found at http://www.nap.edu/readingroom/books/nses/:Science as Inquiry: researchers usually inquire around how physical, living, or designed equipment function. Conceptual principles and also knowledge guide scientific inquiries. Historical and current scientific knowledge influence the design and also interpretation of investigations and also the evaluation of proposed explanations make by other scientists.Physical Science, interactions of Energy and also Matter: Electricity and magnetism room two facets of a single electromagnetic force. Moving electrical charges produce magnetic forces, and moving magnets develop electric forces. These effects help students come understand electric motors and generators. Physical Science, preservation of Energy: The complete energy of the world is constant. Energy can be moved by collisions in chemical and also nuclear reactions, by irradiate waves and other radiations, and in numerous other ways. However, it deserve to never it is in destroyed. Together these move occur, the matter involved becomes steadily much less ordered.Physical Science, interaction of Energy and also Matter: All energy can be thought about to be either kinetic energy, which is the energy of motion; potential energy, which counts on family member position; or energy contained by a field, such as electromagnetic waves. Physical Science, interaction of Energy and also Matter: In some materials, such as metals, electrons flow easily, vice versa, in insulating products such as glass they deserve to hardly flow at all. Semiconducting materials have intermediate behavior. At low temperatures part materials end up being superconductors and offer no resistance come the flow of electrons.Science and also Technology: science and an innovation are sought for different purposes. Scientific inquiry is driven by the desire to understand the natural world, and technical design is driven by the need to accomplish human needs and also solve person problems. Technology, by its nature, has a much more direct result on society than science because its function is to solve human being problems, help humans adapt, and fulfill person aspirations. Technological solutions might create brand-new problems. Science, by its nature, answers concerns that may or may not directly influence humans. Sometimes scientific advances difficulty people"s beliefs and also practical explanations worrying various aspects of the world.
DEMONSTRATION EXPERIMENT: adjust ELECTRICAL energy INTO mechanically ENERGYMaterialsEach college student or each team of college student will need the adhering to materials to carry out this experiment:1-inch stole nail100" spool small-gauge insulated copper magnet wire (#25)knife switch4-inch iron nail6-volt batterysmall steel staplespaper clips or tacksProcedureView the shown instructions for a visual outline of this project.Wrap the 4-inch nail v a coil that 25 to 50 transforms of the wire. Connect one end of the coil to one terminal of the knife switch. Attach the other terminal the the knife move to the battery. Attach the finish of the coil to the various other terminal of the battery. Hold the tip of the 1-inch nail close to the flat end of the 4-inch nail. Close the knife switch quickly and then open up it. (Do not leave that closed.) What happens? (The 1-inch nail will be pulled towards the 4-inch nail. This is mechanical energy in action. The mechanical power is led to by the attractive pressure of the electromagnet. Currently imagine a one of electromagnets the you can turn on and also off one after another. Using this device, you could make the nail relocate in a circular pattern.)Explore the people OutsideAsk students to list makers that usage the spinning activity of motors to do work. Have actually students determine the kind of mechanical job-related done through the spinning parts of each of this machines. (A strength lawnmower"s spinning blades cut grass; a car"s rotate wheels relocate the car down the street; a tape player"s spinning spool breakthroughs the audio or video clip tape)Explore the Film and Web SitePresent associated clips native the movie Tesla: understand of Lightning to the class. The adhering to are part suggestions:04:30 - 11:41My beforehand Years: Tesla"s beforehand education18:36 - 23:21War of the Currents: The fight between Edison"s direct current and also Tesla"s alernating current23:21 - 27:40 Niagara: synopsis of the very first hydroelectric plantAfter viewing clips from the film, ask college student to compose a report around the collection of obstacles that led young Nikola Tesla come his creation of the AC induction motor. How did Tesla take advantage of his opportunities and overcome obstacles to his success? How essential to Tesla"s success was his science education? come find extr information on which to base this report, have actually students refer to the Life and Legacy area that this site.What do You Think?Ask student to discuss what life can have to be like before electric electric motors came into common use. What could your community have to be like? To give students an idea the the enormity that Tesla"s contributions to the world, kinds a course outing to a historic museum to watch how civilization lived and worked prior to Nikola Tesla conceived and also designed the first long-distance strength transmission mechanism in 1895.ASSESSMENT RECOMMENDATIONSThe teacher should consider the following when assessing students:How fine each student described the idea of the engine in class discussion. Just how did the students to compare the procedure of a simple electromagnet to the magnets functioning in a motor.How well might students draw a diagram of an induction motor and also explain the rotating magnetic ar that renders it operate.How fine did class discussion present that the students construed not just the functioning of the engine but also the benefits of motors operating far away from power plants.
EXTENSIONSGuide students v a discussion of what happens inside an electric generator or dynamo. A coil of many turns the copper wire is rotated between the North and South poles that a very an effective magnet. As the rotating coil of wire passes one pole of the magnet, electron in the cable are moved in one direction. When the rotating coil of wire passes the various other pole the the magnet, these electrons are pulled in the opposite direction. Because the electrical current keeps reversing direction, it is called alternate current.
|Tesla for Teachers Index|
|Lesson plan developed by Jim and Judy Hardesty|
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