4. Consider a half-wave rectifier circuit shown in Fig. 3 that operates from a 120V(peak-to-peak) 60-Hz household supply. Use the constant-voltage-drop diode model with $V_D = 0.7V$.
a) Find the turns ratio of the transformer required to provide an output voltage of 6V (peak-to-peak).
b) Determine the conduction percentage of the diode.