During the transition time or turn-on time the forward anode voltage is decreased from 90% to 10% & the anode current increases from 10% to 90% of the initial value.
During the turn-on time of an SCR (Silicon Controlled Rectifier), the forward anode voltage is decreased from 90% to 10% of its initial value, while the anode current increases from 10% to 90% of its initial value.
This transition time is the period during which the SCR switches from the forward blocking mode to the forward conducting mode.
During turn-on, the voltage across the anode and cathode of the SCR is reduced by applying a trigger signal to the gate.
This causes the SCR to start conducting, and the anode current begins to increase. At the same time, the voltage across the SCR starts to drop due to the conduction of current.
The turn-on time is the time required for the SCR to reach its full conduction state.
This time depends on the circuit parameters and the characteristics of the SCR. During turn-on, the SCR is effectively acting like a closed switch, and the anode current is limited by the external circuit resistance.