My dad recently bought an electric fishing lure that will only turn on when submerged in water, but you charge it by connecting electrodes to the outer metal hoops. How does it not short-circuit under water? Does the water act as a “connector” that closes the circuit somehow to turn on the motor?
In: 1
Water is a lot more conductive than air.
Generally the designer use two circuits. One for detection and another for the motor.
Only a small portion of the energy is spent for detection.
Then this small detection signal is used and amplified to power the motor.
It is explained here:
https://www.wellpcb.com/water-detector-circuit.html
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