When connected in 'series', what happens to the overall voltage of batteries?

When batteries are connected in series, the overall voltage of the system is the sum of the individual voltages of each battery. This means that if you have two or more batteries, each providing a specific voltage, the total voltage output will increase with each additional battery added to the series connection.

For example, if you connect two 1.5-volt batteries in series, the total voltage will be 1.5 volts + 1.5 volts, resulting in a total of 3 volts. This principle is fundamental to electrical circuits and is based on the properties of series connections, where the current remains the same but the voltages add up.

This understanding is crucial for effectively using batteries in various applications, as it allows for achieving higher voltage levels needed for specific devices or systems. Therefore, increasing the total voltage is the correct outcome when batteries are connected in series.