Once an SCR is turned on, it remains on until what condition is met?

An SCR, or Silicon Controlled Rectifier, is a semiconductor device that functions as a switch. Once triggered into the 'on' state, it remains conducting as long as the current flowing through it exceeds a certain level known as the holding current. The holding current is the minimum current required to keep the SCR in its conducting state. If the current falls below this threshold, the SCR turns off.

To elaborate, when the SCR is initially turned on (or triggered), it allows current to flow through it, and it stays on as long as the current stays above the holding current level. If the current decreases due to a reduction in input voltage or load conditions, once it drops below the holding current, the SCR will stop conducting and turn off.

While removing input voltage might seem like a viable choice, this action does not automatically turn off the SCR if the current remains above the holding level. Similarly, applying reverse bias can reverse the SCR's operation but typically is not a practical way to turn it off intentionally since it needs to be in the off state initially. Resetting the circuit could involve a manual intervention or circuit design aspect, but that does not represent how the SCR operates regarding current levels.

This understanding illustrates why removing the holding current is the proper