Electrostatic principle: people can dance on the stage under the light. Can small pieces of paper dance on the plastic board with the accompaniment of music? Let's do a little experiment. First, we prepare some small pieces of paper and a plastic stick, put them on the table, rub the plastic stick back and forth many times, and then suck it with the rubbed plastic stick immediately. At this time, a miracle appeared and a small piece of paper was worn. I started dancing. Why is this? In fact, this is the role of static electricity. How did static electricity come from? Originally, matter is composed of molecules, and molecules are composed of atoms, and atoms are composed of negatively charged electrons and positively charged protons. Under normal circumstances, the number of protons in an atom is the same as the number of electrons, so it is not charged. However, once an external force is applied, electrons surround the nucleus and get out of orbit. Leave the original atom A and invade other atoms B. Atom A is positively charged due to the lack of electrons, which is called cation, and atom B is negatively charged due to the increase of electrons, which is called anion. The reason for the uneven distribution of electrons is that electrons are derailed by external forces, which contain various energies (such as kinetic energy, thermal energy, chemical energy, etc.). ). Any two objects with different materials can be separated after contact, which will generate static electricity. This is called triboelectrification. In our daily life, in the dry and windy autumn, we often encounter this phenomenon: when we take off our clothes and sleep at night, we often hear crackling sounds in the dark, accompanied by blue light; When you meet and shake hands, as soon as your fingers touch each other, you will suddenly feel a sharp pain in your fingertips, which is shocking; When I get up in the morning to comb my hair, my hair tends to "float", and the more I manage it, the more chaotic it is. When you pull the door handle and turn on the tap, you will get an electric shock, and you will often make a "bang, bang" sound. This is static electricity that happens to the human body, and some of it will cause harm to the human body. Knowing the principle of static electricity, we can try our best to avoid its harm to people, and we can also use this principle to manufacture machinery and equipment to serve people. Question: Two answers: An energy-saving experiment weekend, my father and I did an energy-saving experiment together. Why do you want to do this little energy-saving experiment? All this stems from a bad habit of mine: my father often reminds me to turn on the energy-saving lamp when I go to the toilet, but I always turn on the incandescent lamp. Dad said incandescent lamps give off a lot of heat, and electricity is wasted. However, I'm a little curious. Why can't I feel the heat? Dad said it was because the light bulb was too far away from us and we couldn't feel it. However, I still didn't believe it, so I took my father to do this experiment together. First, my father took out a multimeter from the toolbox, put a thermometer on the light bulb and told me to turn on the light. I saw that the numbers on it kept beating, and soon it reached 1 17 degrees. As we all know, boiling water is only 100 degrees. Then, we went to the living room to test the energy-saving lamps. Its light is bright, but the test result is unexpected. Its temperature is only 46 degrees, and it is not hot to touch with your hands. Finally, we went to test the incandescent lamp in the bedroom and easily rose to 88 degrees. This temperature is not low, you can burn big bubbles when you touch it! After this experiment, I understand that although ordinary light bulbs, energy-saving lamps and incandescent lamps are all light bulbs, the heat is different. Energy-saving lamps save much more electricity than other light bulbs. If other bulbs have too much heat, the greater the heat, the greater the waste, so we must learn to save energy.