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This lesson covers how loudspeakers and microphones work, linking the motor effect and electromagnetic induction — as required by the Edexcel GCSE Physics specification (1PH0), Topic 8: Magnetism and Electromagnetism. You need to understand that these two devices are essentially the same device operating in reverse.
A loudspeaker converts an electrical signal (varying current) into sound. It uses the motor effect.
| Component | Function |
|---|---|
| Permanent magnet | Provides a constant magnetic field |
| Coil of wire (voice coil) | Carries the varying current; placed in the magnetic field |
| Paper cone (diaphragm) | Attached to the coil; vibrates to produce sound waves |
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