Mechanical to Sound.
Mechanical energy to electrical energy
A speaker converts the energy of discrete electrical impulses to the energy of sound waves in the air.
SOUND
Mechanical energy to electrical energy
The speaker on the phone converts electrical energy into sound energy, which generates the audio you hear during the phone call.
Crating the Circuit alone would be electric energy and when the speaker is operating it would turn into sound energy.
A vibrating speaker uses electrical energy to power its internal components, which in turn produce sound energy through the vibration of the speaker cone. The sound energy is then transferred as mechanical energy through the air as sound waves.
SOUND
Radios use eletrical energy
electrical energy to mechanical energy
kinetic energy
potential energy