1. The problem statement, all variables and given/known data A particular 12V car battery can send a total charge of 84 A-h (ampere-hours) through a circuit, from one terminal to the other. (a) How many coulombs of charge does this represent? (b) If this entire charge undergoes a change in electric potential of 12V, how much energy is involved? 2. Relevant equations 3. The attempt at a solution I'd just like some advice in starting the question, simply because I'm not accustomed to working in Ampere-hours. Just a hint would do nicely.