Why do you hit electric appliances?

Formation of thunder and lightning: Weather accompanied by thunder and lightning is called thunderstorm in meteorology. In thunderstorm weather, when the potential difference between clouds and the ground reaches a certain intensity, discharge will occur, and lightning will hit the ground or target, thus causing lightning strike. According to research, the lightning current intensity can usually reach tens of thousands of amperes and the temperature can reach 20,000 degrees Celsius. The harm degree of such a strong current and high temperature can be imagined.

Therefore, lightning strike is lightning, not thunder. Therefore, it is inevitable to dodge when you see lightning.

For the electronic equipment group in the building, there are six main channels for introducing lightning: 1. The antenna, feeder, power line, signal line and grounding line of all electronic equipment in the building are the lightning entry channels of the building; 2. Connect various power lines and "long" distance signal lines in the building; 3. Lightning shock wave induced by magnetic field eddy current around all metal pipes in buildings with public grounding when direct lightning current flows; 4. Lightning shock wave induced on the metal surface during lightning discharge: 5. Lightning high impact of direct lightning shooting down buildings at lightning strike points; 6. Lightning recoil current when direct lightning strikes down buildings with lightning spots. This kind of current can enter the electronic equipment through the grounding wire of the adjacent building, which will cause discharge between the shell and the movement of the electronic equipment and damage the electronic equipment.

Residents are especially reminded to turn off household appliances such as computers and televisions when it thunders, and unplug power plugs, signal wires and computer network cables. Prevent lightning from invading from power lines and signal lines, damaging electrical appliances and causing fire or electric shock death. Try not to make phone calls in rainy days to reduce the damage caused by induced lightning current along telephone lines; Don't use the outdoor antenna of the TV. If lightning strikes the TV antenna, it will spread into the room along the TV antenna, threatening electrical appliances and personal safety. When it thunders, people should not stand under the electric light; Do not open the window in thunderstorm weather to prevent spherical lightning from entering the house; Stick your head out of the window or touch the metal frame of the window with your hand, and you may be struck by lightning; Don't pull the wires for drying clothes and bedding to windows, doorways and lightning protection downlead, so as not to lead the wires into the room. If the lightning protection measures are proper, the losses caused by lightning will be greatly reduced.

How to prevent lightning strike

July 4, 2005 15:44 China Meteorological Film and Television Information Network.

Meteorologists point out that if you are still outdoors when lightning strikes, you should pay attention to the following points:

1. It is not advisable to stay on the top of the mountain, ridge or building.

2. It is not advisable to stay near iron fences, metal clotheslines, overhead metal bodies and railway tracks.

3. Not suitable for swimming in outdoor swimming pools and lakes.

4. It is not advisable to stay under isolated trees or chimneys.

5. It is not advisable to drive a motorcycle or ride a bike.

6. It is not advisable to take an umbrella in an open field, and it is not advisable to carry metal tools, badminton rackets and golf clubs on your shoulders.

7. You should quickly hide in a building protected by lightning protection facilities, or in a vehicle with a metal roof and a cabin with a metal shell.

8. If you don't meet the above conditions, you should kneel down immediately, lean forward and put your arms around your knees.

If you are near a building with lightning protection facilities when a thunderstorm occurs, you should pay attention to the following points:

9. It is not advisable to move on the sky surface of buildings, because when direct lightning strikes the sky surface, strong current will cause casualties.

10. Don't touch antennas, water pipes, barbed wire, metal doors and windows, external walls of buildings, and stay away from live equipment such as wires or other similar metal devices.

1 1. Close doors and windows to prevent dangerous side lightning and ball lightning from invading.

12. computers, color TVs, stereos, DVD players and other weak current equipment should not be used near the exterior walls at home. It is best not to use these devices when lightning occurs.

In addition, you should also listen to, watch or check the weather forecast online, so that you can predict the risk of lightning and take preventive measures to avoid or reduce the losses caused by lightning.