I was posed the question of whether or not you would be able to start a car with 8 small 1.5V batteries in series (thereby creating the required 12V most cars run on). I immediately answered "no", with my reasoning being that the small AA batteries would not be able to supply enough current for the car.
Although I know this to be true, I have been thinking more and more about the reason behind this. Although there are many factors involved, would it be correct to say that the main determining factor for a battery's "current pushing ability" is its internal resistance?
My reasoning behind this is that, when the internal resistance of the battery is relatively high, and due to ohms law where I = V / R, the resistance of the battery will play a greater role in determining the current pull at low load resistances, but not much of a role at high load resistances?
This also makes sense to me, as it seems like car batteries tend to have internal resistances of many magnitudes smaller than tiny AA batteries.