1: (10 marks) Design a half-wave diode rectifier circuit with a peak AC input voltage of 20V and a load resistance of 100 ohms. Calculate the DC output voltage and ripple factor. Question 2: (10 marks) For a single-phase full-wave rectifier with a transformer secondary voltage of 15Vrms and a load resistance of 50 ohms, calculate the DC output voltage and ripple factor. Include a circuit diagram. Question 3: (10 marks) Create a circuit diagram for a half-wave SCR rectifier with an input voltage of 30Vrms, load resistance of 75 ohms, and an SCR firing angle of 45 degrees. Calculate the average output voltage. Question 4: (10 marks) Design a three-phase full-wave SCR rectifier with a line voltage of 220Vrms. Assume a load resistance of 80 ohms. Calculate the DC output voltage and power factor. Include circuit diagrams