If it reaches a critical value of about three million volts per meter, called the breakdown field, the air becomes a conductor and a discharge occurs: current bridges the gap.
If it reaches a critical value of about three million volts per meter, called the breakdown field, the air becomes a conductor and a discharge occurs: current bridges the gap.
一旦达到每公尺约300万伏特这个临界值（称为崩溃电场），空气即成为导体并开始放电──电流连系了空气的间隙。