Answer :
Final answer:
The 12-V automobile battery with 850 CCA has the smallest internal resistance as higher CCA indicates lower internal resistance. Ampere-hours in car batteries reflect the charge capacity, with the energy content being watt-hours, calculated as Ah multiplied by volts.
Explanation:
Considering two different 12-V automobile batteries on a store shelf with ratings of 600 and 850 cold cranking amps (CCA), the battery with the highest CCA rating, which is 850 CCA in this case, would generally have the smallest internal resistance. The CCA rating indicates how much current a battery can provide at cold temperatures. Higher current capabilities often imply lower internal resistance since resistance is inversely proportional to current flow, according to Ohm's law (V = IR).
When relating to battery ratings, ampere-hours (Ah) correspond to the charge capacity of the battery. It is a measure of how much electric charge a battery can provide at the rated voltage over a certain time period. The relationship between ampere-hours and energy content is that energy in batteries is measured in watt-hours, which is calculated by multiplying ampere-hours by the voltage (Ah x V = Wh).