Small electric motor model experiment instrument tool Educational toy for cultivating students' interest in physics, more intuitive and easy to understand the main structure of the motor. Verify the relationship between armature steering and current direction and direction of field lines Material: Metal Specification: 1. When conducting DC motor experiment, connect 3V~6V DC voltage to the two terminals, that is, normal operation, the increases with voltage, if it is not turned, it can be manually adjusted. 2. Pay attention to the two brushes before touching the power supply, so as not to cause a short circuit. 3. The permanent magnet N is extremely red, S is extremely white or blue, pay attention to the color code when installing Size Chart: Size: 14 x 9 x 11 cm/ 5.51 x 3.5 x 4.33 inch Package Includes:(2 Pack) 1 x Hand Crank Generator Model