4.70 A full-wave bridge-rectifier circuit with a 500-Ω load operates from a 120-V (rms) 60-Hz household supply through a 6-to-1 step-down transformer having a single secondary winding. It uses four diodes, each of which can be modeled to have a 0.7-V drop for any current. What is the peak value of the rectified voltage across the load? For what fraction of a cycle does each diode conduct? What is the average voltage across the load? What is the average current through the load?