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A SCR is a ________ switch.

  • A SCR is a One directional switch.
  • When an SCR is forward-biased, it conducts current in the forward direction like a diode.
  • But unlike a diode, when a gate signal is applied to the SCR, it can latch on and continue to conduct even after the gate signal is removed, until the forward current drops below a certain threshold.
  • This behavior makes it useful in various applications, such as in motor control, lighting control, and power regulation.
  • Therefore, an SCR can be thought of as a one-directional switch in the sense that it can only conduct current in one direction, but it is not a simple on/off switch that can be controlled by a single signal.
  • Instead, it requires a gate signal to turn on, and once it is turned on, it will continue to conduct until the current drops below a certain level or until a reverse voltage is applied.