In the given circuit, assuming point A to be at zero potential, use Kirchhoff's rules to determine the potential at point B.

Explanation

Using Kirchhoff.s first rule, we find that current flowing in branch DC is 1 A from D to C.
Now, applying Kirchhoff.s second rule to the circuit ACDB, we have
`V_A + 1+1 xx 2 -2 = V_B`
`V_B = V_A + 1`
But `V_A = 0` volt , hence `V_B = 0 + 1 = 1V`