What symbol represents a battery cell?

The symbol that represents a battery cell typically consists of two parts: the positive terminal and the negative terminal, illustrated in a manner that conveys their connection and function. The correct representation often includes a line or rectangular shape that indicates the basic structure of the battery along with distinct markings for the positive and negative terminals.

The first option accurately depicts this setup: a line with the symbols for the terminals represented as "-[+" where the horizontal line indicates the body of the battery while the "__-[" component represents the negative terminal and the "+", the positive terminal. This aligns well with conventional diagrams used in electrical schematics.

In contrast, while the other choices depict elements that might suggest electrical connections or components, they do not conform as closely to standard representations of a battery cell in diagrams. The symbols for positive and negative terminals may be present, but the overall structure and clarity in depicting a battery cell's function and connection found in the first option stand out as the most representative of a battery cell in electrical schematics.