The figure below shows the parts of a moving-coil loudspeaker. A coil of wire is positioned in the gap between the north and south poles of the cylindrical magnet. Explain how the loudspeaker converts current in an electrical circuit to a sound wave. – 6082

One thought on “The figure below shows the parts of a moving-coil loudspeaker. A coil of wire is positioned in the gap between the north and south poles of the cylindrical magnet. Explain how the loudspeaker converts current in an electrical circuit to a sound wave. – 6082”

1. The current in the electrical circuit keeps changing, and this current flows through the coil. As the current passes through the coil, it experiences a force which can push it inwards or outwards. If the direction of the current changes, the direction of the force also changes. A bigger current means a bigger force.

   Because the current is constantly changing, the coil starts to vibrate. These vibrations make the attached cone vibrate as well. When the cone vibrates, it makes the air molecules around it move.

   This movement of air creates changes in air pressure, which are needed to form sound waves. The air molecules get squashed together to make compressions and then spread out to make rarefactions, and that’s how sound travels.

   Reply