Principle of lightning rod: In thunderstorm weather, when charged clouds appear over high-rise buildings, lightning rods and the top of high-rise buildings will induce a lot of charges. Because the needle of lightning rod is sharp, the tip of conductor always accumulates the most charge when electrostatic induction is carried out. In this way, the lightning rod collects most of the charge. The lightning rod and these charged clouds form a capacitor. Because it is pointed, that is, the relative area of the two plates of this capacitor is very small, and the capacitance is also very small, that is to say, it can hold very little charge. Moreover, it collects most of the charge, so when there is more charge on the cloud, the air between the lightning rod and the cloud is easily broken down and becomes a conductor. In this way, the charged cloud and the lightning rod form a path, and the lightning rod is grounded, so that the lightning rod can lead the charge on the cloud to the earth, thus not causing danger to the high-rise building and ensuring its safety.

Lightning rod: Lightning rod, also known as lightning rod, is a device used to protect buildings, tall trees and so on from lightning.

The lightning rod is composed of lightning receptor, grounding down lead and grounding body. Lightning arresters are usually made of round steel or steel pipes, with a diameter of 1.5 ~ 20 mm and a length of 1 ~ 2 m, which are fixed at the upper end of the pillar and connected to the grounding body through the grounding down lead. ?

When the Lei Yun-to-ground discharge channel develops near the ground, because the lightning rod tip protrudes from the ground and is well grounded, the electric field intensity near the lightning rod tip increases, and charges with opposite polarity accumulate, which leads to the discharge developing towards the lightning rod and finally hitting the lightning rod, effectively introducing lightning energy into the ground.