雷电是一种大气中放电现象，产生于积雨中，积雨云在形成过程中，某些云团带正电荷，某些云团带负电荷。它们对大地的静电感应，使地面或建（构）筑物表面产生异性电荷，当电荷积聚到一定程度时，不同电荷云团之间，或云与大地之间的电场强度可以击穿空气（一般为25-30KV/cm），开始游离放电，我们称之为"先导放电"。云对地的先导放电是云向地面跳跃式逐渐发展的，当到达地面时（地面上的建筑物，架空输电线等），便会产生由地面向云团的逆导主放电。在主放电阶段里，由于异性电荷的剧烈中和，会出现很大的雷电流（一般为几十千安至几百千安），并随之发生强烈的闪电和巨响，这就形成雷电。

Lightning is an atmospheric discharge phenomenon, which occurs in cumulonimbus. During the formation of cumulonimbus clouds, some clouds are positively charged and some clouds are negatively charged. Their electrostatic induction to the earth generates anisotropic charges on the surface of the ground or buildings. When the charges accumulate to a certain extent, the electric field strength www.zhamen.net.cnwww.guntong.net.cnwww.jiaodaiji.org.cnwww.diandongment.cn

www.sjzdiandongmen.cnwww.sjzbanjia.com.cnbetween different charge clouds or between clouds and the earth can break through the air (generally 25-30 KV/cm) and start free discharge, which we call "pilot discharge". The cloud-to-ground pilot discharge is a gradual development of Cloud-to-Ground leap. When it reaches the ground (buildings on the ground, overhead transmission lines, etc.), it will produce the main discharge from the ground to the cloud cluster. In the main discharge stage, due to the intense neutralization of heterosexual charges, there will be a large lightning current (usually tens of kiloamperes to hundreds of kiloamperes), followed by strong lightning and loud noise, which forms lightning.