Discussion
Which measurement expresses a battery's ability to crank in cold weather?
Answer: A
Cold cranking amps is the current a battery sustains for thirty seconds at minus eighteen degrees while holding a defined voltage. Ampere hours and reserve capacity describe endurance rather than cranking. Each rating answers a different question. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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