Scr silicon controlled rectifier - - a three - electrode solid - state device which permits current to flow in one direction only , and does this only when a suitable potential is applied to the third electrode , called the gate 可控硅整流器可控硅整流器? ?三電極固態(tài)元件,只有當匹配的電壓作用于第三電極(選通電極)時,才能夠保證電流朝一個方向流動。