If you reverse the two conductors on a sound-powered circuit, what happens?

• A. It has no effect; operation is not prevented.
• B. It prevents operation.
• C. It reverses the signal.
• D. It doubles the loudness.

Answer: (A)

Swapping the two conductors in a sound-powered circuit has no effect because these two-wire, non-polarized transducers respond to the actual current flow and its variations, not to a specific polarity. The microphone converts acoustic energy into electrical variations, and the headset converts those current variations back into sound. Whether you connect one lead or the other to either terminal, the same current waveform drives both devices, so the signal is conveyed just as before. There’s no extra power, no polarity requirement, and no change in loudness or operation from simply reversing the leads.