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.

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