Question

3.
Calculate the equivalent enf of the following
wries connection of two battares, having emfs
6 and ta
and internal nusistanu 82 and 82,
Where R is external resistance.
Lumo
ea
b Б
a
WW
ww
R​

Answer 1

Since the batteries are connected in reverse polarities, the net potential applied to the circuit =8V−4V=4V

The net resistance in the circuit =R+r  

1

​  

+r  

2

​  

 =9Ω+1Ω+2Ω=12Ω

Hence, the current in the circuit =  

12Ω

4V

​  

 =  

3

1

​  

A

Potential difference across P and Q =IR =  

3

1

​  

A×9Ω =3V