![]() ![]() The demo requires a 9V battery, 2 iron nails, thin gauge wire or magnet wire, an AM/FM radio or Walkman, a tape deck with a speaker that can be played without a tape but with the cassette door open (most old school style cassette players work for this), wire strippers, and a male headphone jack that has been connected to a small coiled wire around an iron nail or bolt. It also provides a link between electricity and magnetism. ![]() The next activity demonstrates that information can be conveyed in an electromagnetic wave in a simple manner. Refer to the associated activity Creating Working Radios from Kits: AM I on the Radio? for more instructions. Again, point out that they are doing no more than oscillating up and down, yet their motion is traveling down the line of students.Ĭarry out the following two activities once students have been presented with the lesson information since these activities serve to provide examples of wave and magnetism concepts. The wave travels down the line transversely (similar to "the wave" at a sporting event), because particle displacement occurs perpendicular to the direction of wave propagation. The wave begins to travel as the first student stands up and then crouches back down, causing the student next to him/her to do the same. To illustrate transverse wave forms, line up the students side by side, beginning in a squatting position, holding hands. This example shows longitudinal waves, since the direction of displacement is in the same direction of wave propagation. This illustrates how the wave moves, as the waveform is merely individual particles displacing one another, the individual particles do not actually travel along the waveform, but rather oscillate back and forth. The instructor, at the front of the line, creates an initial disturbance of the first particle, by pulling the student forward slightly, so that his/her motion is transferred back through the line of students. Have all students line up, standing in a straight line, one behind the other with their hands resting on the shoulders of the person in front of them. To introduce this lesson, have students pretend that they are human wave particles. International Technology and Engineering Educators Association - TechnologyĪ basic understanding of electricity, voltage, resistance and power is helpful. This lesson focuses on the following Three Dimensional Learning aspects of NGSS:Ĭonduct an investigation and evaluate the experimental design to produce data to serve as the basis for evidence that can meet the goals of the investigation.Īlignment agreement: Thanks for your feedback!įorces that act at a distance (electric, magnetic, and gravitational) can be explained by fields that extend through space and can be mapped by their effect on a test object (a charged object, or a ball, respectively).Ĭause and effect relationships may be used to predict phenomena in natural or designed systems. Explain the process by which AM radios work.Ĭonduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact.Ĭlick to view other curriculum aligned to this Performance Expectation.Describe how electromagnetic waves propagate.Determine the amplitude and frequency of a waveform.Identify transverse and longitudinal waves.It is also the task of engineers to take the concepts learned in school or other types of training and find practical uses and applications for this knowledge, such as AM radios.Īfter completing this lesson, students should be able to: Understanding how waves and magnetic fields work are basic concepts of electricity and magnetism that all engineers must know. ![]() This engineering curriculum aligns to Next Generation Science Standards ( NGSS). This prepares students to be able to comprehend the functioning of the AM radios they will build during the associated activity. Several demonstrations are performed to help students better understand these concepts. ![]() Then students learn general concepts about magnetic fields, leading into how radio waves are created and transmitted. Waves are first introduced by establishing the difference between transverse and longitudinal waves, as well as identifying the amplitude and frequency of given waveforms. Students learn how AM radios work through basic concepts about waves and magnetic fields. ![]()
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