Discussion
Determine the number of cells to be connected in series-parallel connection to form a 6 V battery with 4 AH capacity. The available cells are rated at 1.5 V and 2 AH.
Answer: B
Each cell is 1.5 V and 2 AH. To get 6 V the cells must be in series, and 6 / 1.5 = 4 cells per row. To get 4 AH the rows must be in parallel, since the capacity adds, and 4 / 2 = 2 rows. So 4 series cells and 2 rows are needed, which is 8 cells in all, option (B). The other options give the wrong voltage or capacity: 2 series cells would give only 3 V, 8 series cells would give 12 V, and 8 rows would give 16 AH.
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