The potential drop increases as more cells are connected in series form.
In series circuit connection, the current across the cells is the same but the voltage varies.
When a circuit is connected to a single cell, the potential drop is given as;
[tex]V = Ir[/tex]
where;
V is the potential drop
I is the current
r is the resistance
However, when two cells are connected in a row or serially, the total voltage drop is given as;
[tex]V = Ir_1 + Ir_2\\\\V = I (r_1 + r_2)[/tex]
Thus, potential drop increases as more cells are connected in series form. The electricity in our homes and factories are connected in parallel form to reduce this voltage drop.
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