In this science experiment you can do at home, we walk through how to make a simple electric speaker. Using a Styrofoam bowl, card stock paper, electrical tape, and a few scientific materials, we create a simple speaker that uses an electromagnet to convert the flow of electrons into vibrations (which we interpret as sound)! To use this experiment for a science fair project, consider questions like: How many coils of wire create the loudest speaker? What distance between the neodymium magnet and the speaker produces the clearest results?

The reason we are using around 12m of 32 gauge magnet wire is that this will give us around 6 ohms of resistance and this should prevent the electromagnet from overheating during use. Even with the correct resistance do not leave this speaker running unsupervised.

Attaching it to a 3.5mm plug will produce some sound similar to a headphone but to turn up the volume plug your speaker into a surround sound unit which gives a greater output.

▶️ Get supplies to make your own electric speaker:
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▶️ Procedures
1. Place several neodymium magnets on a steel surface.

2. Make a tube out of construction paper just larger than the neodymium magnets.

3. Take one end of the tube and wrap it with a piece of tape, sticky side facing outward.

4. Take this piece of tape and wrap it with 12 meters of 32-gauge magnet wire. Be sure to leave about a foot at either end of the magnet wire in order to make connections.

❗️ NOTE: Make sure to tape this magnet wire in place so it does not come loose during the experiment.

5. Take the paper end of the tube and cut it into four sections

6. Tape the cut end of the tube to the bottom of the styrofoam bowl.

7. Create folded paper springs by cutting 3 in x .5 in strips of paper and folding 4-5 times.

8. Attach paper springs to the bottom of the bowl so that the coil can slide up and down freely over the neodymium magnets.​

7. Sand the coating off the loose ends of the magnet wire and attach it to either a surround sound or a 3.5mm headphone plug.

8. Choose a song to play through the speakers.

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