AQA · Physics · 8463
GCSE Physics: Microphones
Magnetism and electromagnetism · AQA GCSE Physics (8463), specification point 4.7.3.3. Cards are generated from the exam board's own specification for "Microphones", and every card links back to the page it came from. Higher tier only. Separate science only. Specification © AQA — used with attribution.
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Which effect do microphones use to convert sound into an electrical signal?
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The generator effect — a conductor moving in a magnetic field induces a potential difference.
Microphones use the ? effect to convert sound waves into variations in current.
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generator
What does a microphone convert the pressure variations of a sound wave into?
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Variations in current in an electrical circuit.
In a moving-coil microphone, what makes the coil move?
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Sound waves make the diaphragm vibrate; the coil is attached to the diaphragm, so it moves back and forth in the magnetic field.
Why does the moving coil in a microphone produce a current?
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The coil moves in a magnetic field, so a potential difference is induced across it (the generator effect), which drives a current in the circuit.
How does a moving-coil microphone reproduce the frequency of a sound?
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The diaphragm and coil vibrate at the same frequency as the sound wave, so the induced current varies at the same frequency.
A moving-coil microphone is essentially which device working in reverse?
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A moving-coil loudspeaker — the microphone uses the generator effect, the loudspeaker uses the motor effect.
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