Hand generator technology small production scientific experiment small invention physical children’s toy diy

https://www.sinoning.com/wp-content/uploads/2021/11/SNP99-手摇发电机.mp4 Size: 90*75mm Product name: hand crank generator Subjects: Physics, Magnetism, Electricity Principle: Mechanical energy and magnetic energy are converted into electrical energy Material: plastic accessories, wire and electronic accessories Purpose: Cultivate and exercise children’s scientific awareness and manual and brain skills. It can also be used as a teaching model, classroom, after-school homework, and school production competitions.