Why does the tip of a lightning rod release electrons into the air continuously?
(on the isolated conductor surface charge accumulation conductor), the charge density and the conductor surface shape. In the part of the charge density of concave near zero in flat areas, the largest in the tip of the site. When the charge density reaches a certain value, the electric charge generated will be great, so that the air breakdown (the ionization of ions in the air), and the conductor charged opposite charge and the conductor will appear and discharge sparks, and can hear the acoustic.
Lightning is another good example. Lightning arrester installation of tall buildings, when charged clouds near the building, building on the opposite charge induction and clouds, the charge will be gathered in the lightning rod tip, reaches a certain value after the beginning of the discharge, this will not stop the charge on buildings in and out and never to make the building a strong charge discharge damage needed. Lightning is the essence of 2 charged between strong discharge in the discharge process of energy release huge. The other end is connected to the earth buildings, and clouds of the same charge into the earth.
Under the strong electric field, the sharp object part of a discharge phenomenon called tip discharge, he belongs to a corona discharge. His principle is pointed at the object with large curvature, power line density, and potential gradient, resulting in the breakdown occurs near the gas discharge. If the object is particularly strong in the dark or tip discharge, then often can see a light blue halo around it
If there is an outline of a high voltage line, a point discharge will occur. As a result of the discharge of the power source, the discharge will continue to be provided while the discharge is required, and the discharge will continue
