Final answer:
A loudspeaker produces sound by converting oscillating electrical currents induced by electromagnetic waves into mechanical vibrations of the speaker cone. These vibrations create pressure waves in the air which we perceive as sound.
Step-by-step explanation:
An alternating current receiving coil in a loudspeaker works by having the electromagnetic waves induce oscillating currents within it. These currents are then amplified and converted to mechanical movements in the speaker cone, which oscillates back and forth. The oscillation of the cone generates sound waves that we can hear. This process starts with electromagnetic waves transmitted by an antenna, which carry energy from their source. Once received by the antenna of the loudspeaker, the oscillating currents match the frequencies of the incoming waves. A coil in the speaker within a magnetic field will move due to the Lorentz force, with motion corresponding to the frequency of the current, thus causing the attached speaker cone to vibrate at the same frequency. As the coil and cone vibrate, they cause variations in air pressure, creating sound waves.