N-FETs are like NPN transistors – the gate pin needs to have higher voltage than the source pin for the FET to open. P-FETs are like PNP transistors, too – the gate pin of a P-FET needs to ...

NPN (negative-positive-negative ... once a small trigger of current is detected at the gate leg. Once the thyristor starts to conduct, current continues to flow until the voltage between the ...