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

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

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

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

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

In a 1- Φ half wave controlled rectifier with firing angle α & angular frequency of ω, the circuit turn-off time in secs can be given by

A single-phase half wave circuit has Vs = 230 V with a R load of 100 Ω. Find the average load current at α = 30°

A single phase 230 V, 1 kW heater is connected across a 1-phase 230 V, 50 Hz supply through an SCR. The firing angle of the SCR is adjusted to give a rms voltage of 155 V. Find the power absorbed by the heater element.

For a single phase half-wave thyristor circuit with R load, the input power factor is given by

In a 1-Φ half wave controlled rectifier with R-L load,t he load voltage waveform from ωt = π to ωt = π+α = β (extinction angle) is