P = UI
U = IR
P = I²R
I = I₁ = I₂ = I₃
I₁ = U₁ / R₁
I = U₁ / R₁
R = R₁ + R₂ + R₃
P = (12 / 3)^2 * (3 + 6 + 8) = 272 Вт
P = UI
U = IR
P = I²R
I = I₁ = I₂ = I₃
I₁ = U₁ / R₁
I = U₁ / R₁
R = R₁ + R₂ + R₃
P = (12 / 3)^2 * (3 + 6 + 8) = 272 Вт