gcsescience.com 14 gcsescience.com
Loudspeaker.
The loudspeaker
uses a coil
which can slide backwards and forwards
over the central pole
of a circular permanent
magnet.
The coil is joined by the brown bars to a paper
cone, shown below.
The wire from the amplifier
carries an alternating current
which makes the coil (and the paper
cone) move backwards
and forwards
at the same frequency
as the changing current.
The paper cone then moves
the air backwards and forwards
which creates the sound.
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Copyright © 2007 Dr. Colin France. All Rights Reserved.
