Abstract: Kelvin water dripping generator uses the most common water droplets to accumulate electrical charge, and applies positive feedback so that electrical charge keeps accumulating in the device and the potential difference between gets higher and higher. But the cause of the potential difference is still controversial now, and the experimental device is rough and lacks of a unified production specification, the quantitative injury of each fac- tor causing the potential difference is scarce, as well. That is why this experiment is instable and difficult to spread. In this paper, we adopt the idea of control variables to conduct quantitative injuries of each factor causing the po- tential difference, and found the best conditions to carry out this experiment, verified the cause of the potential difference, made an improved standardized Kelvin water dripping generator.

Key words: Kelvin water dripping generator, control variables, standardize, improve