Communication - Vibration, Electronic Signals, and Electromagnetic Radiation

1995 The Regents of the University of California

by Regan Lum

An Introduction...

The main methods of communication are speaking and listening. One of the limitations of communication through speech is that the listener must be within shouting distance. Through the miracle of science, we can speak to a friend that is far away by sending our voice through the air, wire, or glass fiber in the form of electromagnetic radiation or electronic signals. We can even speak to machines and tell them what to do.


We can change our voice into an electronic signal and send it through a wire (speaker or telephone). We can convert that electronic signal into electromagnetic radiation (radiowaves or light in our case) and send it through the air or fiber optics. We can even save our voice (or music) on a magnetic tape and play it back. Modern technology even allows us to control machines that are miles away.


Science, Technology, and Society from the Science Framework (pages 158 - 160)


The students will be able to:

Grade Level:

9th - 12th grade


Topics already covered:

For more information about this lesson plan:


Lesson Plan References

For more information, email your comments to or contact Regan Lum.

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