The Kelvin water drop generator is often used for educational purposes to visualise how charge is
transferred when water drops separate from a solid. Here, we discuss an alternative and simpler
setup, which allows one to visualise the charge transfer that occurs when water drops move off a
hydrophobic polymer. One can visualise the charge transfer directly as light pulses from a light
emitting diode, or monitor the current pulses generated by the water drops. Further investigation of
the current pulses provides information about how single water droplets or fluctuating streams move
down the incline.