A water microphone or water transmitter is based on Ohm's law that current in a wire varies inversely with the resistance of the circuit. The sound waves from a human voice cause a diaphragm to vibrate, which causes a needle or rod to vibrate up and down in water that has been made conductive by a small amount of acid.
A water microphone or water transmitter is based on Ohm's law that current in a wire varies inversely with the resistance of the circuit. The sound waves from a human voice cause a diaphragm to vibrate, which causes a needle or rod to vibrate up and down in water that has been made conductive by a small amount of acid.
Source: Wikipedia "Water microphone" · CC BY-SA 4.0
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