A single-phase half-wave thyristor circuit with R load is triggered at an angle of α = 0°. As such, the maximum value of the average output voltage would be given by
Consider Vs = Vm sinωt.

Below shown ideal circuit is triggered at a firing angle of α. The voltage across the SCR is zero from ωt =

A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo

Below shown ideal circuit is triggered at a firing angle of α. From ωt = π to 2π+α

In a single phase half-wave thyristor circuit with R load & Vs=Vm sinωt, the maximum value of the load current can be given by

In the below given circuit, the SCR is triggered at a certain firing angle α. The load current falls to zero at ωt =

In the method of phase control, the phase relationship between ___ & ___ is controlled by varying the firing angle

For the below given circuit with firing angle α & angular frequency of ω, the circuit turn-off time in secs can be given by

The average output voltage is maximum when SCR is triggered at ωt =

For a single phase thyristor circuit with R load & firing angle α, the conduction angle can be given by