The new course of study for elementary schools introduces Hand Generators (HGs) and Electric Double Layer Capacitors (EDLCs) into 6th grade science classes. These inexpensive equipments enable teachers to develop various teaching materials for children. We explored the features of HGs and EDLCs through a series of trial lessons and discussed their safe use in lower grade classes. For example, we must maintain the appropriate voltage level when we use an HG to turn on a miniature bulb, otherwise the bulb may be damaged. We also have to be careful with withstand voltage and polarity of EDLCs. If the capacitor is subjected to voltage exceeding its working voltage, or if it is connected with incorrect polarity, it may burst. Based on these trials and experiments, we prepared a teachers' manual on the safe use of HGs and EDLCs at elementary schools. We compiled it in the form of questions & answers so that it helps teachers to answer students' questions in class.