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paper 2
magnetism
loudspeakers and headphones
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Cards (17)
What should you be able to describe by the end of this video?
How a
moving coil loudspeaker
works
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What is the motor effect?
A force experienced by a
current-carrying
conductor in a
magnetic field
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In which devices is the motor effect used as discussed in the video?
Loudspeakers
and
headphones
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What is a key component of a moving coil loudspeaker?
A
cone
with
a
coil
of
wire
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How is the coil of wire connected in a loudspeaker?
To an
alternating current
electrical supply
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What happens when current passes through the coil of wire?
It generates a magnetic field
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How do the magnetic fields interact in a loudspeaker?
They either
attract
or
repel
each other
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What does the resultant force on the cone cause?
The
cone
to
move
in
and
out
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What happens when the direction of the current switches?
The direction of the
force
on the
cone
reverses
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How can the frequency of the sound produced be changed?
By changing the
frequency
of the
AC supply
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What does a higher frequency produce in terms of sound?
A higher
pitch
sound
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What effect does increasing the size of the current have?
Increases the
amplitude
of the vibration
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What does an increased amplitude of vibration do to the sound?
Increases the
volume
of the sound
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Where can you find more questions on moving coil loudspeakers?
In the
revision workbook
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Who is the intended audience for this video?
Higher-tier
students
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What is the role of the cone in a loudspeaker?
To generate
sound waves
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Why is the interaction of magnetic fields important in loudspeakers?
It produces the force that moves the
cone
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