To acquire the scientific thinking, students should conduct experiments and measurements. And it would also be important to try to quantify using physical formulas. So, we have developed a teaching material of micro hydropower generator that can quantify the energy conversion efficiency. We use a classical water wheel that is suitable for low head drop. This apparatus can be used in laboratory or field experiments. To clarify the power generation performance, it was carried out the resistance load test and the head drop change test. We also clarified the education effects of this apparatus.