Which of the following describes the construction of a battery?

A battery is made up of multiple electrochemical cells, which work together to produce electrical power. Each cell consists of an anode, cathode, and electrolyte, and they generate voltage through chemical reactions. In many applications, especially in larger batteries used in devices or electric vehicles, these individual cells are connected in series or parallel configurations to achieve the desired voltage and capacity.

While a single cell can indeed be referred to as a battery in some contexts, commonly, the term “battery” implies a collection of multiple cells, hence the correct choice highlights the primary characteristic of a typical battery. The other options describe aspects that might pertain to batteries or individual cells, but they do not capture the general definition accurately. For example, using a magnetic field is not a standard operational principle for batteries, and while primary and secondary cells differentiate types of cells (non-rechargeable and rechargeable, respectively), they do not collectively define a battery’s construction.