A singer uses a moving-coil microphone. The microphone is connected through an amplifier to a moving-coil loudspeaker.
Explain how the microphone converts the sound of the singer into a varying current, and how the loudspeaker converts the varying current back into sound.
Your answer should refer to magnetic fields and to the movement of the coils.
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.