Applicable object: Science and technology innovation projects of primary and secondary school students, scientific and technological practice of teenagers, etc

Dynamic parameters (can be used for experimental report^_ ^): the output voltage of the solar panel is about 2V under full working condition, and the output voltage is about 4V after two solar panels are connected in series; the starting voltage of motor is about 1.7V, and the voltage under full working condition is about 4V. Here, the full working condition refers to the value of each power part when the car moves forward at full speed under sufficient illumination

Lighting requirements: the car does not use battery assistance, so it has higher requirements on lighting. It is required to see the whole sun on sunny days. It is best to see most of the blue sky, and the midday sun is appropriate. If the car is properly installed, if the first driving fails, most of the lighting conditions are not satisfied, so you can choose a good lighting time to do more tests. Pay attention to different seasons and different sun angles, The loss of light can be compensated by adjusting the tilt angle of the solar panel

Knowledge points:

1. Use the solar energy to convert the small car into electric energy

2-preliminary understanding of the power transmission structure, through the motor shaft output power, through the belt to the axle pulley to do work. There is a deceleration relationship between the big and small pulleys, which is directly proportional to the diameter of the pulley

The basic knowledge of series and parallel circuit is involved in the production of car. Two solar panels are connected in series

4 - contact with small physical equipment, such as electric motor, solar panel, etc., pull into the distance between abstract concepts and objects. Cultivate hands-on ability and make a rare science toy, which can broaden our horizons