1. Fruit Generator: Use lemons, apples, oranges and other fruits to generate electricity and learn the principles of electricity generation.
2. Paper Cup Microphone: Use materials such as paper cups and earphone wires to make a simple microphone and understand the principle of signal transmission.
3. Simple Wind Turbine: Use small fans, magnets, coils, and other materials to learn the principles of wind power generation.
4. Simple Telescope: Use two magnifying lenses, tape, and other materials to learn the principles and methods of producing telescopes.
5. Simple solar water heater: Use black plastic bags, transparent plastic bags, aluminum foil and other materials to learn the working principle of solar water heaters.
II only have one solar panel and now want to use it to generate electricity to charge a small fan or battery. What materials are needed? And what is the connection method to connect?
Okay.
1. The solar charging fan uses solar energy to generate electricity without consuming traditional energy, which has positive significance for environmental protection.
2. Solar charging fans generally have a lightweight design and are easy to transport. Very convenient for outdoor activities, travel, camping and other occasions.
3. The solar charging fan is powered by solar energy and does not need to touch the power cord, which reduces the risk of electric shock and is safer to use.
4. To sum up, the solar charging fan is of good quality.
The positive and negative polesif can be directly connected to a small fan. If you are charging a mobile phone, it is better to use a DC-DC step-down module to step it down to 5V, or directly. use a 7805 three-terminal voltage regulator block to step down, but the efficiency is lower.
If the battery has an overvoltage protection board, you can simply connect a diode in series with the output end, then connect it to the battery