What is contained within a battery?

A battery is essentially a device that stores electrical energy and consists of multiple electrochemical cells connected in series or parallel. Each cell contains its own chemical components that facilitate the chemical reaction necessary for producing electricity. When these cells are combined within a single unit, like in a battery, they work together to provide a higher voltage or greater capacity.

Typically, a standard battery used in everyday applications—like AA, AAA, or a car battery—contains multiple cells. For instance, a common household battery may contain several smaller cells working in unison to provide the necessary power output. This is why the notion of a battery containing two or more cells is accurate; it brings together the output and functionality of these cells into one cohesive unit to deliver electricity effectively.

While a single cell can operate as a battery, it wouldn't be classified as a "battery" in the more common sense of the term, which implies an assembly of cells. The other options do not accurately represent the primary makeup of a battery; resistors are components used to manage current flow but aren't part of the battery's structure, and a circuit breaker serves a different function in an electrical system, protecting circuits rather than being a component of a battery itself.