The right answer is 7.5V.
A series circuit is a circuit in which the various components are placed one after another offering only one path for the current.
When several cells are connected in series, the total voltage will be the sum of the voltages of each cell, ie 5 cells of 1.5V or 7.5Volts.
1. Efficient use of space
2. Elimination of groundwater contamination
3. Energy generation
4. Lower carbon footprint
