Question

Answer 1

\(\dfrac{U1}{U2}=\dfrac{I1}{I2}\Rightarrow U2=\dfrac{I2.U1}{I1}=\dfrac{\left(1,2+0,3\right)12}{1,2}=15\left(V\right)\)

Answer 2

\(\dfrac{I_1}{I_2}=\dfrac{U_1}{U_2}\Rightarrow U_2=\dfrac{I_2.U_1}{I_1}=\dfrac{\left(1,2+0,3\right).12}{1,2}=15\left(V\right)\)

Vậy hiệu điện thế cần tăng: \(15-12=3\left(V\right)\)