Discussion
Which nominal voltage does one lead acid cell produce?
Answer: B
Each cell gives about 2.1 volts, so six in series give the nominal twelve volt battery, and a fully charged one measures around 12.6 volts at rest. Nickel cells give 1.2 volts and dry primary cells 1.5, which is why the other figures are familiar but wrong here. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape.
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