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The Silicon Controlled Rectifier (SCR) is a four-layer, three-junction semiconductor device widely used as a controlled rectifier in power electronics. It is primarily used for switching and controlling high power AC and DC circuits. One of the most important characteristics of SCR is that it acts as a unidirectional device, meaning current flows only in one direction from anode to cathode. The SCR remains in the off state even when forward biased unless a triggering pulse is applied at the gate terminal. Once it is turned on, it continues to conduct current ____ ____ ____ _______ _______ _____ __________ _____.
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