Which transducer converts electrical energy to sound for listening?

• A. Earphones & Speakers
• B. Bells & Buzzers
• C. Lighting lamp
• D. Microphone

Answer: (A)

To hear sound from an electrical signal, you need a device that turns electrical energy into mechanical vibrations that create air sound waves. Earphones and speakers do exactly that: the electrical audio signal moves a diaphragm, producing vibrations that become the sounds you hear. A microphone does the opposite—it converts sound into an electrical signal. A lighting lamp converts electrical energy into light. Bells and buzzers also generate sound from electricity, but they’re mainly signaling devices, not for reproducing audio for listening. So earphones and speakers are the correct choice because they convert electrical energy into audible sound for listening.