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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.

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