as we know in transistors, current controls current, in JFET voltage controls current, but how about SCR? I have learnt that the gate can be triggered using both voltage and current (called gate triggering voltage or gate triggering current). So can one say SCR is both voltage and current controlled device? In other words can we trigger the gate using both voltage and current sources?
I can't understand why the resistor is being used? My book says it provides noise suppression and better on off time, but I really couldn't get that.