Which component serves as the output transducer in a hearing aid?

The receiver in a hearing aid functions as the output transducer. Its primary role is to convert electrical signals, which have been processed and amplified by the hearing aid, back into sound waves that the user can hear.

When sound is captured by the microphone, it is then converted into an electrical signal. This signal is amplified by the amplifier, enhancing the sound's loudness according to the user's hearing loss. Finally, the receiver takes this amplified electrical signal and transforms it into audible sound waves that are delivered into the ear.

While options like the microphone and amplifier are crucial components in the process of capturing and enhancing sound, they do not serve as the output transducer. The speaker, while a common term, is generally used to refer to larger systems, whereas the receiver specifically pertains to hearing aid technology and functions directly in the auditory feedback chain for the user.