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What is a Loudspeaker?
A loudspeaker is a
device
that transfers
electrical energy into sound.
How does a Loudspeaker Work?
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.
