1. Electrical Energy to Magnetic Energy: When an electrical signal from the radio is applied to the speaker's voice coil, it creates a magnetic field around the coil.
2. Magnetic Energy to Mechanical Energy: The interaction of the magnetic field generated by the voice coil with the permanent magnet in the speaker creates a force that causes the voice coil to move back and forth. This mechanical movement is what produces the sound waves.
3. Mechanical Energy to Sound Waves: As the voice coil moves, it pushes and pulls the speaker cone, which creates vibrations in the air. These vibrations are what we perceive as sound.