如题所述
开路电压: Uoc = Uab = Ucb + Uac = Us + U1 + 2U1;
U1 = R*Is;
等效电阻: Ro
U = U1+2U1=3U1 = 3*R*I;
那么;Ro = U/I = 3R;
;
满意请采纳哈