Discussion
Which reading indicates a fully charged twelve volt battery at rest?
Answer: C
An open circuit reading of 12.6 volts or more after a rest period indicates full charge, while 12.0 volts is around a quarter charged. The higher figures are charging voltages measured with the engine running, which is a different measurement entirely. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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