九百多字英语实验作文八年级 The first step is to make a windmill. I cut the kraft paper into a square, fold it diagonally twice, cut more than half along the crease, and then glue one corner of each piece to the center, and then fix the fan blade on the small motor. A simple windmill is done. The second step is to splice the basic circuit. A simple circuit is made of batteries, light-emitting diodes, switches, wires, etc. in the electronic building blocks. When the switch is turned on, the light-emitting diodes light up! The third step is to verify wind and solar power generation. How to verify that solar energy and wind power can generate electricity? I asked my father for advice. With the cooperation of my father, I connected the windmill with the electricity meter, and blew against the windmill's fan blade with a hair dryer. The fan blade quickly turned up, but the pointer on the electricity meter did not move. What's the matter? Does the wind not generate electricity? When I felt very confused, my father quietly said to me, "there are positive and negative current, you may install it upside down, change it and try again." It suddenly dawned on me. I quickly changed the position of the wire. This time, as soon as the fan blade turned, the pointer on the meter swung; Turn up the wind and the pointer will swing more. Then, according to the same method, we connect the meter with the solar panel for experiments. When the bulb of the desk lamp is illuminated against the panel, the pointer of the meter swings. The closer the panel is to the bulb, the greater the angle of pointer swing. The fourth step is to assemble a simple device for continuous power supply. I connected windmills, solar panels, meters, switches and other components to the basic circuit with wires. After repeated attempts and the help of my father, I finally assembled a simple device that uses solar energy and wind power to continuously supply power. Continuous power supply principle: when there is wind, sun or both, part of the electricity generated by wind and solar energy will supply power to the led to light up; The other part is stored in the battery. When there is neither wind nor sun, the battery can supply power to the LED and make it light up. In this way, whether the weather is good or bad, whether there is wind or not, it can ensure that the LED lights up and realize continuous power supply. 本文来源：https://www.wddqw.com/doc/ef4f930fa02d7375a417866fb84ae45c3b35c2f6.html