Question

In the circuit shown, the potential difference between A and B is?

Answer 1

Answer:

I am not able to answer because I forgot this concept . I am not quite sure .

Answer 2

Answer:

Explanation: P.D. across AB will be equal to battery equivalent across CD

VAB=VCD=E1/r1+E2/r2+E3/r3/1/r1+1/r2+1/r3

1/1+2/1+3/1/1/1+1/1+1/1=6/3= 2 Volts