Electromagnetic Power Battery Train Maglev Train Toy School Science Physics Experiment Technology Children's Teaching GiftPrinciple: the coil is energized to generate a magnetic field, and the same...
Science Experiment Electromagnetic Lnduction Power Train Puzzle Toy Kids Science Technology STEM Maglev Physics Teaching GiftPrinciple: the coil is energized to generate a magnetic field, and the...
Hand power generation: Size 8 * 10 * 11 Rotating the mechanical arm, through the belt pulley, big wheel with small wheel, small wheel with big wheel, do more power to generate current. Working...