R1= 6 ом
R2= 2 ом
U1= 12 V
U2=?
A=?

1). R = R₁ + R₂ = 6 + 2 = 8 (Ом)2). I = U₁/R₁ = 12 : 6 = 2 (A)3). U₂ = I*R₂ = 2*2 = 4 (B)4) U = U₁ + U₂ = 12 + 4 = 16 (B)