When testing an SCR with an ohmmeter, which terminals must be shorted?

When testing a Silicon Controlled Rectifier (SCR) with an ohmmeter, shorting the anode and gate is necessary to properly test the component. This action allows the SCR to be placed into the forward-biased state, which is crucial for confirming its functionality. By shorting these terminals, you create conditions that simulate the gate-triggering signal, enabling current to flow from the anode to the cathode when voltage is applied, if the SCR is functioning correctly.

This procedure helps to verify whether the SCR can be turned on by checking its behavior in a controlled manner. If the ohmmeter shows a low resistance reading after shorting the anode and gate while applying the probes to check the anode and cathode, it indicates that the SCR is operational, allowing current to pass through.

Considering the other options, shorting gate and cathode would not enable the SCR to enter a conducting state, as the gate is typically used to control the flow from anode to cathode, not the other way around. Shorting the anode and cathode directly doesn't align with standard testing procedures, as it would not allow for the controlled testing of the gate function. Lastly, the option regarding source and drain pertains to MOSFETs