When the AC voltage applied to the anode rises in the positive direction, current flows through the gate-cathode section of the SCR.
当施加到阳极的交流电压上升，在正方向上，电流流经可控硅的栅极-阴极部分。
When it reaches the trigger point (assume 5 milliamperes for this SCR), the SCR fires and conducts through the anode-cathode section.
当达到触发点(假定为5毫安这个SCR)，可控硅触发，并进行通过阳极-阴极部分。
Cathode located at middle of back-thorax section.
阴极置背胸段正中处。
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