Discussion
When checking a good SCR with an ohmmeter it will :
Answer: C
A good SCR will show high resistance in both directions.
Between anode and cathode an SCR is a four-layer PNPN device with three junctions. Whichever way the ohmmeter is connected, at least one junction is reverse biased, and without a gate trigger the SCR stays off, so the meter reads a high resistance both ways.
Low resistance in one or both directions would indicate a shorted device. Behaviour like a diode, low one way and high the other, would also mean the SCR is faulty.
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