Question

Answer 1

a, Hiệu đt \(U=R.I=25\left(V\right)\)

b, \(I\) tăng 2 lần \(1\left(A\right)\)

\(\Rightarrow U=2.25=50\left(V\right)\)

c, I giảm 3 lần \(I=0,5:3=\dfrac{1}{6}\left(A\right)\)

\(\Rightarrow R=\dfrac{25}{\dfrac{1}{6}}=150\left(\Omega\right)\)

Answer 2

a,\(=>U=I.R1=50.0,5=25V\)

b,\(=>U=2I.R1=2.0,5.50=50V\)

c,\(=>R2=\dfrac{U}{\dfrac{1}{9}.0,5}=\dfrac{25}{\dfrac{1}{18}}=450\left(om\right)\)