Which of these statements correctly compares battery cells in series with the cells in parallel?
a. When battery cells are in series, the voltage stays the same but the cells last longer.
b. When battery cells are in parallel, the voltage increases, but the cells last the same amount of time.
c. When battery cells are in series, the voltage increases and the cells last longer.
d. When battery cells are in parallel, the voltage stays the same and the cells last longer.
e. When battery cells are in parallel the voltage is the same and they last just as long as when the cells are in series.
d
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