Question 3 An AC voltage controller produces a variable AC voltage at a fixed or a variable frequency from a fixed AC supply voltage as shown in Figure Q3. T₁ DK ـــة is T₂ io www R Figure Q3. Single-phase AC voltage controller with resistive R load a. With the aid of diagram and voltage waveform, in your own words briefly outline the modes of operation of this controller. (5 marks) b. Generate the equation for the rms output voltage Vo for this controller. Please show all the steps for your derivation including substitution of relevant trigonometric identities in generating the required equation. (10 marks) c. Can this single-phase AC voltage controller be operated with only one thyristor? If yes, support your answer with proper explanation in your own words with relevant diagram and waveforms. (10 marks)