Refer image .1 Potential difference across the top most branch is 1V Refer image. 2 Equivalent resistance of the top most branch is given by the combinations of the 1Ω and the 2Ω resistor. The parallel combination of 1Ω resistor give 0.5Ω Refer image. 3 ∴ The equivalent circuit would be Refer image. 4 Rtotal =2+0.5 =2.5Ω Itotal =
V
Rtotal
=
1
2.5
=
2
5
=0.4A Now, using current division, Refer image. 5 V=I1R1=I2R2