a. V across point BC = ?

I = 1 A

R_p = 6 ohm [derived in c. below]

So V = IR

= 6A × 1Ω

V = 6 ohm

I₁ =

I₁ =

I₁ = 0.6 A

Similarly I₂ =

I₂ =

I₂ = 0.4 A

b. I = 1 A

R = 5 ohm

So V across AB = ?

We know V = IR

V = 5A × 1Ω

V = 5 V

V across AC = ?

Total R = 11 ohm [derive in c. below]

V = 1 × 11

V = 11 V

c. Total resistance = ?

Resistors R1 and R2 are in parallel

So

R_p = 6 ohm

Total R = 5 ohm + 6 ohm

R = 11 ohm