Pupils' manual steps
The specific manufacturing method is: lift one end of an abandoned can (such as Lulu beverage can) and beat the other end with a round hammer. Roll up two 1 batteries with thick corrugated cardboard and put them in a can, with the positive pole facing up and the negative pole facing down. Find a suitable plastic cover (for example, the magic big roll cover can just be buckled on Lulu's beverage can), and dig a round hole in the center of the cover, the size of which is suitable for the light bulb to be inserted tightly. Insert the bulb base into the small hole. Take a section of tracing wire, peel off the wire skin at both ends, wrap one end around the lamp cap, and tie a small hole at the other end from the side of the plastic cover. Put the plastic cover on the jar. Check whether the bulb and battery are in close contact. Disposable flashlights will be ready here. When in use, press the wire on the side wall with your thumb on the unpainted weld away from the can, and the flashlight will glow. When your thumb jumps off the wire, the flashlight will go out, which is very convenient to use.
1. Simple fan physics plus art plus production: a jar, a pair of scissors, a tinplate, a batten, a four-wheel drive motor, a bottle of super glue, and some colored LED bulbs (or bulbs and diodes).
Answer: Cut off the upper half of the tank by scissors about 1cm, and keep the remaining tank, that is, first make a "cup", then draw three pieces on the cup at equal intervals, then keep these three pieces, cut off the rest, and then present a circular base with three blades, like a propeller, and then drill a round hole slightly smaller than the motor shaft in the middle of the base with scissors tips.
B: There is a tinplate (that is, an ordinary piece of iron) that wraps the motor tightly and then nails it to the batten.
C: Fix the blade on the central shaft of the motor with super glue to ensure the vertical, horizontal and windward performance of the blade.
D: Connect the two wires of the motor to the LED bulb, and ensure that the wire interfaces are connected normally (positive and negative, with good contact).
E: Run forward with a stick in hand, or put it on a bike. Under the action of wind power, the blades are driven to rotate, and then the motor rotor is driven to rotate. As a result, magnetoelectricity is generated, and the LED light bulb lights up. If the wind is steady, it is no different from a battery. If the wind is fluctuating, the LED bulb will light up and go out. If you add a sensitive charger, you can store the current and then release it, which will be ideal.