Bad starting can also be a result of physical resistance in the engine, especially as temperatures fall below the normal operating range. When engines get cold enough they put enormous load on the starter motor which has to draw more amperage to compensate.
I think it's very important to teach people that moving electric charges, represented by current, result in magnetic forces, and that these magnetic forces are what cause motors to turn. And an alternator or generator reverses the relation by spinning a magnetic field to generate current, which is why it charges a battery.
>Bad starting can also be a result of physical resistance in the engine, especially as temperatures fall below the normal operating range.
Is that true? Low temperatures directly affect the maximum output current of the battery, but I don't think engine tolerances are such that the engine starts to effectively seize up below freezing.
I think it's very important to teach people that moving electric charges, represented by current, result in magnetic forces, and that these magnetic forces are what cause motors to turn. And an alternator or generator reverses the relation by spinning a magnetic field to generate current, which is why it charges a battery.