Handson physics aid for learning and testing: A hand crank DC generator that converts mechanical energy into reliable DC power for circuit kits and small motors. Ideal for repeatable demonstrations of energy conversion and electromagnetic induction in classrooms, labs, or home education. Plugandplay, easy to operate: Simple mechanical crank design supplies uninterrupted DC power without external batteries or outlets. The ergonomic handle reduces user fatigue for longer demonstrations and practical handson experiments. Stable, longlasting performance: Built with wearresistant bearings and durable components to maintain steady output over extended use. Designed for repeatable classroom activities, fieldwork, and hobby projects that require consistent operating readiness. Clear compatibility and function: Intended to power small DC motors and standard educational circuit kits used in STEM teaching and DIY projects. Use it to demonstrate how mechanical motion generates electricity and to provide direct, observable power to miniature experiment tools. Practical benefits for educators and hobbyists: Reinforces physics concepts through active learning and repeatable experiments. Eliminates dependence on batteries or wall power for portable demonstrations. Durable construction reduces maintenance and downtime during lessons or fairs. Typical use scenarios: 1. Classroom demonstration: Use the crank to show electromagnetic induction, power a small motor, and have students measure voltage and explain energy conversion. 2. Science fair or fieldwork: Provide onsite, reliable DC power to miniature experiment tools and motors without needing electrical outlets. 3. DIY hobby projects: Test circuit kits and small motors during prototyping, troubleshooting, or handson STEM activities at home. Materials and performance highlights: Mechanical hand crank generator design for direct energy conversion. Ergonomic handle for comfortable manual operation. Wearresistant bearings and longlasting components for stable output and repeated use. This hand generator is a practical, dependable tool for educators, students, and hobbyists seeking a handson way to explore physics and power small experimental devices.