What is typically the result of connecting two cells in series?

When connecting two cells in series, the voltage across each cell indeed adds together to give a total voltage output. Each cell contributes its own voltage to the overall circuit, which means that if you have two cells, you simply sum their individual voltages to find the total voltage available to the circuit. For example, if one cell has a voltage of 1.5 volts and the other also has 1.5 volts, the total voltage of the series connection would be 3 volts.

The current does not double when cells are connected in series; it remains the same as the current flowing through a single cell. Additionally, the resistance of the overall circuit does not become zero; it depends on the components in the circuit as well as the internal resistances of the cells themselves. If the voltage decreases, it would be contrary to the principle that the total voltage increases with a series connection of cells. Thus, the key outcome of connecting two cells in series is the additive nature of their voltages, which amplifies the power available for the load.