Speakers are devices that turn electrical signals into sound waves that we can hear! The diaphragm, which is a cone shaped piece of flexible material, vibrates to create sound. Behind the diaphragm are the suspension and other parts that hold the diaphragm in place, but also help it vibrate. Under that is the voice coil and a magnet. The voice coil is a piece of copper wire that has been shaped into a spring-like shape. When electricity flows through the voice coil, it turns momentarily into an electromagnet. The electromagnet is not permanent and can repel or attract the other permanent magnet. As this happens, the repelling and attraction of the two magnets start to move the diaphragm and cause it to send out sound waves that we can hear!
