1: Take a four-wheel drive motor, put the pen core of a ballpoint pen on the rotating shaft, connect a diode to the output end of the motor, then wind a rope around the pen core, and then quickly pull the rope, and the light will come on.

2. Quite simply, electricity can produce magnetism, and the same magnetism can also produce electricity. If you have a motor, you must also have the power to drive the motor to rotate. The input end of the motor is also the output end. By bridging, connecting four diodes can play a rectification role, the output voltage is stable, and it can be lit by connecting a light bulb.

3. Windmills, motors, small wind turbines, light bulbs and wires.

In the process of converting wind energy into mechanical energy ~

Require mechanical power as high as possible ~

The weight of windmill blades should be small ~

There is also a difference between choosing several blades ~

This needs to be tested by yourself ~

You also need a transmission speed change device ~

Because the speed of the windmill won't be too big ~

You need to speed up through the speed change device ~

Just use the gearbox ~

Steps to convert mechanical energy into electrical energy ~

Because the voltage required by lz is not large ~

Just use a general generator with a fixed pole ~

This output voltage is unstable ~

If necessary, add a voltage stabilizing circuit at the output end ~

4: How small? As long as you have a small four-wheel drive motor, then connect a small light bulb and other electrical appliances, turn its shaft and try to increase its speed, you can. In fact, the principle of generator is the same as that of motor, but the process is the opposite.

Chemically, primary batteries can also be used, that is, inserting an iron wire and a copper wire into an apple is also possible, and it doesn't have to be made of iron and copper, as long as the materials are different. Have fun ~!