Question

For the below figure, the effective potential difference when the batteries are connected in series is .

• A. $20V$
• B. $28V$
• C. $25V$
• D. $15V$

Answer 1

The correct option is C $25V$

In the circuit diagram, the cells are connected in series.
In a series connection of cells, the total potential difference will be the sum of potential differences of all the individual cells.
Effective potential difference $=V_1+V_2+V_3+V_4+V_5$
Effective potential difference = $\text{5 V +7 V +8 V +4.2 V +0.8 V = 25V}$.