DO: Design and build a speaker out of classroom supplies.
NOTICE: The sound from the Coil and Magnet gets louder and clearer after you’ve put them in a speaker.
LEARN: Why does a speaker sound better than the Coil and Magnet by themselves?
For this activity you will need a variety of craft supplies, including but not limited to: cardboard, card-stock, paper cups, tape, scissors, glue. First, you should refresh the students’ memories on what they did in previous activities, including the average optimal height that they found in Activity 2. Have them set up the Control Panel, Magnet, and Coil as they have done in previous Activities and allow them to play with them for a few minutes.
Before they begin building have them all change the Control Panel into the Purple Mode by clicking the Yellow Button four times (cycling through Red, Yellow, and Green). Purple Mode plays a sample song through the Coil and the Magnet. Make sure the slider is all the way to the right. Tell the students to move the Coil at different heights above the Magnet and listen to how it effects the music. Discuss with them that the same ideal height that they found in the last Activity should produce the loudest and clearest music, just as it produced the strongest vibrations before. Explain that the music they are hearing is actually just a lot of different vibrations, playing all at the same time.
Call the students’ attention to the front and show them the craft supplies they have to work with. Tell them that their task for this lesson is to create a speaker that will amplify the volume of the music from the Magnet and Coil using just the craft supplies that you have provided. Instruct them that they should be using the ideal height that they found in the last Activity to make their speaker sound as clear as possible, but beyond that, they can design their speaker however they think is best. The design should hold the Coil and Magnet in position without the student holding them. Instruct them to use the Purple Mode to test how their speaker sounds as they build it and adjust it as needed.
TIP: To simplify the design process, paper speaker templates are available in the Downloads section and can be distributed to each student.
Once they have built their speakers ask them about how the music sounds. Does it sound louder? Why?
BONUS: If you have access to a 3.5mm Audio Cable, the students can plug the Audio Cable into the port labeled “AUX” on the back of the Control Panel and listen to their own music through the speaker they have built. When the Audio Cable is plugged in the Purple Mode will become the Blue Mode, and the Coil and Magnet will play whatever music is playing on the connected device. The volume can be adjusted using the Yellow Slider.
Next Activity: BOSEbuild Speaker