Two cells of e.m.f. 10V and 15V are connected in parallel

Two cells of e.m.f. 10V and 15V are connected in parallel

Apply the kirchoffs law:-15+10+I = 0I = 5 Avoltage across the resisatance =5×1 = 5 voltso emf between point A and B is 15-5= 10 volt