Loudspeakers and Microphones | GCSE Physics Practice
Loudspeakers and microphones use electromagnetism to convert between electrical signals and sound waves.
Does a loudspeaker use the motor effect or the generator effect?
What is Loudspeakers and Microphones | Practice?
"Devices that convert between electrical signals and sound waves using electromagnetism."
Magnetic field lines always point from ____.
Why are step-up transformers used in the National Grid?
Increasing the current through a solenoid will ____ its magnetic field.
What happens to an electromagnet when the current is turned off?
Sound Transducers
Loudspeaker: Motor Effect. AC current in a coil in a magnetic field causes a cone to vibrate.
Microphone: Generator Effect. Sound waves cause a diaphragm/coil to move in a magnetic field, inducing a current.
Both rely on the interaction between permanent magnets and electromagnets.
Changing the frequency of the AC changes the pitch of the sound.
Direct Link: A loudspeaker is essentially a microphone running in reverse!
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