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Activity

Modulated Coil

Curated and Reviewed by Lesson Planet
This Modulated Coil activity also includes:

Transmit sound with an electromagnet. Class members follow the provided direction and build an electromagnet that will transmit sound though a cassette-tape player. As as extension they create an air core electromagnet and compare its performance to the original.

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Concepts
electromagnetic radiation, electromagnetic energy, sound waves, magnetic fields, electromagnetic waves, technology resources
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Instructional Ideas
  • Lead a discussion on products that use a similar type of device
  • Research other types of modulators that can transmit sound
Classroom Considerations
  • Requires a cassette-tape player
Pros
  • Provides two different directions for how to connect the coil to the sound source
  • You can enlarge the images to provide detail on how the connections are made
Cons
  • Does not contain any tips on what to look for to correct the problem if the electromagnet doesn't work