Discussion
In a SCR circuit, the angle of conduction can be changed by changing :
Answer: D
The conduction angle is changed by changing the gate current.
An SCR blocks forward voltage until a gate current pulse triggers it, after which it conducts until its current falls below the holding current. Varying the gate current (or the timing of the gate pulse) changes the firing angle at which the SCR turns on in each cycle, and so the conduction angle and the average power delivered to the load. This is phase control.
The anode voltage is the supply waveform being controlled. The anode current is set by the load once the SCR conducts. The forward current rating is a fixed device specification, not a control variable.
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