We went off of this video to create our electromagnetic speaker.
Materials: Cup Strand of copper wire Small magnets Aux chord Phone 2 Aligator Clips
WHAT DOES IT DO? -Well, it functions like a normal speaker would. It circulates the sound waves and creates sound through the cup. Then, you can hear the music!
HOW IT WORKS -The cup amplifies the sound coming through the coil. The coils create an electric current, whilst the magnet amplifies it and creates the sound. Without the magnet, the music would never come through with sound. When you attach the tips of the copper wire to the tip of the aux chord, it pulls the waves through to create the sounds using the electromagnetic current. In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it. This coil behaves much like a normal (permanent) magnet, with one particularly handy property: reversing the direction of the current in the coil flips the poles of the magnet.
WHAT DOES THIS HAVE TO DO WITH E&M? -The coil provides the electricity. The magnets provide the magnetic field. Together, they create electromagnetism, which creates an electromagnetic current flowing through the "machine".
STEP-BY-STEP TUTORIAL 1) Gather your supplies (listed above^). 2) Take the copper wire and wrap it into a large circle-like coil, leaving about 6 inches of wire on each side. 3) Put a large magnet in the center of the coil and tape them to the bottom of the cup. 4) Attach more smaller magnets to the larger magnet for a more amplified sound. 5) Sand about an inch or two of the enamel off of the left over tips of the wire. 6) Attach the alligator clips to each end of the copper wire. 7) Attach the other end of the clips to the tip of the aux chord. 8) Plug the other end of the aux chord into your device, and hit play! Your speaker should be making music now.