Answer :
Final answer:
To achieve a battery of 6 V from cells with a 1.5 V e.m.f. each, the cells must be connected in a series arrangement, as this adds the voltages of each cell to reach the total desired voltage.
Explanation:
To make a battery of 6 V using cells with an e.m.f. of 1.5 V each, the correct arrangement would be a series arrangement. When cells are connected in series, the voltages of each cell add up while the internal resistances also add, which can sometimes be problematic as it can cause an increase in the overall internal resistance. However, to achieve the desired total voltage of 6 V using 1.5 V cells, four cells must be connected in series (1.5 V + 1.5 V + 1.5 V + 1.5 V = 6 V).
In contrast, a parallel arrangement would not increase the total voltage beyond that of a single cell since voltages do not add up in parallel; it would just increase the capacity of the battery without increasing the voltage. A combination of series and parallel could be used in cases where both voltage and capacity need to be increased, but for the sole purpose of achieving 6 V from 1.5 V cells, series is the correct answer.
