What principle does lightning rod use to avoid electricity?
Lightning gathered most of the charge. The lightning rod and the clouds and the formation of a charged capacitor, since it is pointed that the capacitor two is on the plate area is very small, the capacitance is also very small, that is to say it can hold less charge. But it also gathered a large part so, when the charge, charge more, easily between the lightning rod and the clouds of air breakdown, become a conductor. In this way, the charged clouds and lightning formation pathways, and lightning and grounding lightning. You can put the charge on the earth by the clouds, the right of high-rise building a danger, to ensure its safety.
In fact, the lightning rod should be called "lead lightning needle" is appropriateIn a thunderstorm, building over charged clouds, thunder and needle are at the top of the tall building on a large number of induction charge, due to lightning needle is pointed, and the electrostatic induction, the tip conductor always gathered the most charge.
These huge trees were also charged with a great deal of electricity, and the trees were knocked down by the accumulation of electricityIn the same condition, probably due to the high building safe and sound arrester. In many towers are in a metal, like a needle, the needle upright things, this is the lightning rod.
