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Anonymous users2024-02-12To understand the cause of this problem, first of all, we need to understand the role of lightning rods. Installing a lightning rod is an effective way to avoid lightning strikes. A metal rod is erected at the highest point of the house, and a copper wire is connected to the lower end of the rod, and a metal plate is attached to the end of the copper wire and buried in a damp place deep underground.
The upper end of the rod must be a pointed end or bifurcated into several pointed ends. With such a device, when there are charged clouds in the sky. The tip of the lightning rod is concentrated with a different charge due to electrostatic induction, and the tip is discharged, which is neutralized with the electric phase in the cloud to avoid the occurrence of intense lightning, which is one aspect of lightning rod can avoid lightning.
But this effect is quite slow, and if the accumulation of electricity in the cloud is very fast, or if a cloud with a large charge suddenly flies in, sometimes it is too late to neutralize it in the manner described above, so there is a strong discharge, and the lightning will still occur. However, because the lightning rod is higher than the surrounding objects, its tip is concentrated with the charge of the electricity in the cloud, if the lightning occurs between the cloud and the ground object, the discharge current mainly flows into the earth through the lightning rod, so it will not hit the house or nearby people, but will only hit the lightning rod. It can be seen that the tip discharge effect of the lightning rod will reduce the possibility of lightning between ground objects and clouds. When it was inevitable, it itself was hit by thunder, and the house and people were safe.
Due to the structure and function of the lightning rod, we should pay special attention to maintaining the good conductivity of the lightning rod. Once there is a bad connection, or it is broken, the section above the fracture becomes an isolated conductive system. When there is an electric charge in the cloud, the upper part of the separated part induces a charge with the same name as the electricity in the cloud, and the lower part induces a charge with the same number as the electricity in the cloud.
In this way, not only can it not avoid lightning, but it will also attract lightning disasters. To prevent accidents, it is best to erect several lightning rods in tall buildings. In addition, each lightning rod can only protect a certain amount of floor area.
For larger buildings, several lightning rods are also required.
Therefore, if we stand outdoors in the open on a rainy day, under a big tree, it constitutes a conductive loop similar to that of a lightning rod, so that the current passes through and causes us to be struck by lightning.
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Anonymous users2024-02-11When it rains, there is a large amount of positive charge gathered in the cloud, and the earth itself is a conductor, and the air is an insulator, so the earth, the air, and the cloud are like a capacitor, and the ground is uneven, especially in the mountains, and the distance between these protruding parts of the big trees and the clouds is relatively close, and when the charge accumulated in the cloud reaches a certain level, this will be the same"Capacitance"Breakdown, of course, the first to be electrocuted must be close to the top of the mountain, the tree, at this time if you stand under the tree is very dangerous, so usually if it rains, it is best not to run to the top of the mountain or under the tree, because even if there is no thunder and lightning, there is often a strong wind when it rains, if you blow the tree down, and you happen to be under the tree, you will be crushed if you are not electrocuted.
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Anonymous users2024-02-10Who said that you can't stand under a tree on a rainy day, it should be in the case of thunder and lightning, and you can't hide under a tree.
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Anonymous users2024-02-09The inability to hide under a tree on a thunderstorm day is due to tip discharge.
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Anonymous users2024-02-08According to the principle of tip discharge, because the tree is relatively close to the negative ions in the sky, it is easy to have tip discharge, and it is more dangerous for people to stay below
Lightning is a common natural phenomenon that occurs when positive and negative charges produced by atmospheric friction in nature are close to each other. The voltage between the clouds and the earth can reach several million volts to hundreds of millions of volts, and the current during discharge can reach tens of thousands to hundreds of thousands of amperes. If it is possible to cause immediate death through the human body, it can cause serious damage to buildings and the like.
The tree is tall and conducts electricity easily when wet.
The installation is not standardized, resulting in leakage in rainy days. The switch is tripped.
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