Electromagnetism and Electromagnets
This topic is broken into units to help in formulating cohesive, effective lessons. Clicking on each unit title below will display appropriate activities, lesson plans, or labs.
Unit materials are a subset of all possible materials available for this topic, selected especially with the new physics teacher in mind. You may instead browse all materials for this topic here .
Conceptual Physics Electromagnetism and Electromagnets Units
An electromagnet works on the principle that an electric current not only allows electrons to flow in a circuit, but also generates a small magnetic field. When a wire carrying electricity is coiled, the magnetic field becomes even stronger. Iron or steel objects surrounded by this coiled electric wire also become magnetized. This combination of electronic energy, coiled wiring and conductive metal object forms the basis of an electromagnet.
Lesson Plans:
This site contains instructions for a simple lab using electromagnets made with nails, copper wire, and batteries.
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Activities:
This collection of 41 interactive java tutorials would be an excellent choice to connect physics to "real-world" applications. Designed by well-respected authors, the topics range from simulated magnetic fields and field lines to primers on capacitance, resistance, Ohm's Law, and electromagnetic induction. Included are simulations on how things work, such as vacuum tube diodes, cathode rays, capacitors, AC/DC generators, hard drives, pulsed magnets, and speakers.
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References and Collections:
The TEAL (Technology Enabled Active Learning) project at MIT merges lecture, cooperative learning, and computer simulations of electromagnetic phenomena. Designed for teachers of introductory physics, it is the pedagogy currently followed at MIT for freshmen physics students. Comprehensive course notes accompany the simulations.
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Student Tutorials:
This well-written tutorial from Florida State University helps beginning students navigate the waters of electromagnetic radiation. The diagram of the electromagnetic spectrum is well-designed, and be sure to check out the simulated 3-D electromagnetic wave.
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Student Tutorials:
Inductance is a property of an electric circuit in which a changing magnetic field creates an electromotive force in that circuit or in a nearby circuit. This interactive tutorial for beginning physics students offers comprehensive explanations of magnetic inductance, including sections on Faraday's experiments and Lenz's Law. Five java simulations illustrate Faraday's Law, self-inductance effects, and patterns of magnetic field lines.
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This tutorial gives beginning students a grounding in the physics underlying generators and motors. Clear and concise illustrations help students differentiate the components of each device. The author devotes careful attention to conductor coils and how they are used to cut through lines of force and strengthen a magnetic field. Simple graphs depict the cycles of both AC and DC current waves.
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Activities:
Students gain understanding of electromagnetic radiation as they broadcast radio waves from a transmitter to receiver. They can manually control the transmitter electron or set automatic oscillation. The field can be displayed as a curve or vectors, with students controlling the frequency and amplitude.
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Lesson Plans:
Experiential Learning Unit Grades 11-12 **NOTE: May be taught as a short mini-unit or as a two week project.
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Activities:
This three-minute NASA video introduces the seven categories of the electromagnetic spectrum in a way that is understandable for middle and high school students. Requires Quicktime plug-in to operate.
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References and Collections:
This page provides a broad overview on Remote Sensing (RS), the process of acquiring information about material objects or phenomena without coming into physical contact with the objects.
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This multi-chapter tutorial is sponsored by the highly-respected Federation of American Scientists. For teachers doing a unit on digital imaging, this resource offers a comprehensive look at both theory and applications.
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For students having difficulty understanding the classification system of the electromagnetic spectrum, try this tutorial. It also gives an overview of the technologies emerging in Remote Sensing, which apply the principles of electromagnetic radiation.
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Student Tutorials:
This well-written tutorial from Florida State University helps beginning students navigate the waters of electromagnetic radiation. The diagram of the electromagnetic spectrum is well-designed, and be sure to check out the simulated 3-D electromagnetic wave.
(Open Website )
