空气加热，电弧向上的动作，因为它是密度较低，较凉的空气靠近它，它的速度移动，其中有浮力和阻力都是平等的。
Air heated by the arc moves upward because it is less dense than the cooler air around it, and it moves at a speed for which the buoyant force and the drag force are equal.
人类对电弧很熟悉------它是（这样形成的：）两个电极或两个点充上了电，携带着电流；突然，它们之间的空气充满了微小的，快速移动的电光。
Humans are familiar with arcing, where two poles or points are electrified, carrying an electric current, and suddenly the air between them is filled with a minor lightning bolt - zap.
利用分断电弧过程中的电流动态特性，使用移动平均法提取了每次分断电流的燃弧时间。
According to the dynamic behavior of the breaking current, breaking arc duration is extract from the breaking current waveform by using the concept of moving average of statistics.
埋弧自动焊时，引燃电弧、焊接送丝、电弧沿焊接方向移动及焊接收尾等过程均可实现自动化控制。
Automatic control has been used in the ignition of electric arc, welding wire-feed, movement of arc along welding direction, receiving arc of welding, etc.
如果灯泡在闪烁，电弧在一个新的干净的位置盒旧的烧坏的位置之间来回移动。
Q2: If the bulb is flickering the arc changes jumping between a new clean position and the old burnt position.
如果灯泡在闪烁，电弧在一个新的干净的位置盒旧的烧坏的位置之间来回移动。
Q2: If the bulb is flickering the arc changes jumping between a new clean position and the old burnt position.
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