Part a   
 
 the necessary r.m.s. output voltage (in V) from the alternator is   
 
    15.184364  
 
 Part b   
 
 the peak current (in A) throught the diodes is   
 
    31.415927  
 
 Part c   
 
 the P.I.V. (in V) of the diodes is   
 
    15.184364