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

the lightning rod is composed of lightning receptor, grounding down conductor and grounding body. The lightning arrester usually adopts round steel or steel pipe with a diameter of 15 ~ 2 mm and a length of 1 ~ 2 m, which is 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 tip of the lightning rod protrudes from the ground and has a good grounding, the electric field intensity near the tip of the lightning rod increases, and charges with opposite polarity are accumulated to guide the discharge, thus preventing the building from being hit.

the lightning rod has a certain protective effect.