How to make a small fan scientifically?

How to make a small fan scientifically is as follows:

1. Prepare paper cups and fan blades. Choose a paper cup with a certain rigidity and cut off the bottom. Then cut it into the shape of fan blades with colored paper or plastic cloth, and try to keep the size and shape of fan blades consistent.

2. Install the battery and motor. Put two batteries into the battery box, and pay attention to the position of the positive and negative poles. Connect the wire end of the motor to the corresponding interface on the battery box to ensure firm connection.

3. Install the fan blade and motor. Stick the fan blade on the motor output shaft with adhesive tape to ensure that the fan blade can rotate freely. Then fix the motor on the side of the paper cup with adhesive tape or other fixing methods.

4. Confirm the assembly. Check whether the motor wiring is correct, and then insert the battery box into the battery slot. Twist the fan blade slightly to confirm whether it can rotate freely and whether the motor works normally.

5. Test the fan. Place the paper cup vertically and turn on the battery box switch. You will see the fan blades start to turn, creating a breeze.

6. Improve the paper cup fan. You can decorate paper cups according to your personal preference. You can use colored paper, stickers or colored pens to complete paper cups, which will make paper cup fans more personalized.

The purpose and significance of paper cup fan;

1, dispel the heat: In the hot weather in summer, we often feel sultry and uncomfortable. The paper cup fan can generate a breeze by rotating the fan blades, which helps to dispel the surrounding hot air and makes us feel cool and comfortable.

2, reduce the temperature: the breeze of the paper cup fan can reduce the surrounding temperature, especially in the case of indoor air conditioning or only window ventilation, the paper cup fan can help reduce the indoor temperature and provide a comfortable environment.

3. Entertainment and relaxation: Making paper cup fans is an interesting manual activity in itself, which can stimulate children's creativity and hands-on ability. When using the paper cup fan, observing the rotation process of the fan blades and hearing the sound of the breeze can bring a relaxed and pleasant feeling.

4. Environmental protection and energy saving: Compared with traditional electric fans, paper cup fans use less electricity because they use small motors and batteries. The materials for making paper cup fans are also relatively simple and environmentally friendly, and can be recycled.