A speaker is a device that is used to project sound. Many household devices use speakers such as televisions, computers and radios. Without speakers, we would not be able to hear some of the many sounds around us. A speaker science project will teach the person making the project about sound and how to amplify it. To build a speaker for a science project, several steps will need to be followed that use items found in many households.
Blow up a large balloon and tie it. Make sure you blow the balloon up as full as you can get it without popping it.
Separate the two wires that are moulded together on a 5-foot piece of speaker wire. By making a small slice between the two wires with a wire cutter or utility knife you can easily pull on each wire to separate it into two 5-foot pieces. Wrap the middle section of one 5 feet piece of speaker wire around your hand forming a coil, and tape it together to keep it from unravelling. Leave about 2 feet of each end of the speaker wire unwrapped.
Strip about an inch of insulation from both ends of the speaker wire using a wire stripper.
Insert the ends of the wire into the speaker slots on the back of the stereo. If the stereo has screw terminals, wrap one end around each screw.
Tape the wire that is coiled together to the surface of the balloon.
Turn the stereo on and turn the volume up. Set it to a radio station or play a music CD.
Place a magnet about 3-inches square or round inside the coil of wire. As you place the magnet inside the coil you will faintly begin to hear sound from the stereo.
If you are not able to get a lot of sound after you put the magnet in between the coil on the balloon speaker, try using a larger balloon and be sure it is blown up so that the balloon walls are tight.