Whether you are
listening to the radio or watching TV sound is produced
almost always in a similar and interesting fashion.
Loudspeakers work by turning electric power in to a sound
that people can understand what they are hearing. Located
to the right is a diagram of the components of a
loudspeaker. The yellow part in the picture is an
electromagnet and the orange part is a coil. An electric
signal is sent through the coil depending on the desired
sound. This then creates a magnetic field in the
electromagnet inside the coil. What is interesting about
speakers is they can reverse the current going through the
coil. This will flip the poles of the electromagnet inside
the coil. Located to the right of the electromagnet is a
magnet which is red and blue in the image to the right.
This magnet has fixed poles so as the electromagnets poles
are flipped the magnet will either attract or repel the
coils. This happens so quickly is causes the cone located
to the left in the image to vibrate. This cone then acts a
lot like a drum would when hit and will produce a sound.
