Final answer:
To produce 2 volts, connect two 1-volt cells in series; to maintain 1 volt, connect them in parallel. Connecting in series adds voltages while parallel keeps them the same.
Step-by-step explanation:
To determine how you should connect two 1-volt cells to produce the desired voltage, it's important to understand the differences between series and parallel configurations. When cells are connected in series, their voltages add up, while the current remains the same. On the other hand, when cells are connected in parallel, they share the same voltage, but the currents can add up.
To produce a voltage of 2 volts, you should connect the two 1-volt cells in series. This means you would connect the positive terminal of one cell to the negative terminal of the other cell. When cells are connected this way, their voltages add together, which in this case would give you (1V + 1V) = 2 volts.
To produce a voltage of 1 volt using the same two cells, you should connect them in parallel. This configuration means you connect the positive terminals together and the negative terminals together. In parallel, the voltage across each cell remains 1 volt, the same as the voltage of a single cell.
Therefore, the correct answer is: B. Connect them in series for 2 volts, and connect them in parallel for 1 volt.