Applications of motor and generator effects

A sound can be represented by an electronic signal changing in time to match the sound wave. Loudspeakers use the motor effect to convert electrical signals into sound waves. A moving–coil loudspeaker is made from a cone connected to a coil of wire that moves in relation to a fixed magnet. Microphones use the generator effect to convert sound waves into electrical signals. A moving–coil microphone is made from a diaphragm connected to a coil of wire that moves in relation to a fixed magnet.