[填空题]
(a) What is the potential di 5 v,prt*2 ;(frw4*cmgs rjeri8dd dj4fference between points a and d in (Fig. Belorj ru:2y3k(a+wclsv1+wbmw t5 y6u ;kw a) (same circuit as Fig. Below b,3uc;t5kysrak2mr +u yw+l bww(6 v 1j: ), $V_{ad}$ V
(b) what is the terminal voltage of each battery?
80V battery = V
45V battery = V
a
b