Discussion
When the current through SCR is greater than holding current, then the voltage across the SCR is
Answer: A
Once an SCR is conducting with a current above the holding current, it stays on and the voltage across it is the small forward drop, about 1.4 V (option A), a little above one volt at the usual currents.
Zero volts (B) would be an ideal switch, but the junctions of a real SCR keep a drop of a volt or more. The supply voltage (C) appears across the SCR only in the forward-blocking state, before it is triggered, and half the load voltage (D) is not a state of the device.
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