Not to start an arguement, but the voltage is the "pressure" that pushes the flow of electrons(current-measured in amperes) through the conductor. I'm an electrical engineer and work at an electrical utility company( I have a little background in that). Maybe you learned the water analogy differently???? Also, Ohm's Law is V=IxR. P=VI is a very good equation for this comparison though(I was trying to keep it simple and avoid even basic equations)...And capacitors are helpful in car audio systems. They aren't a majic fix for a weak battery, thin wires, weak alternator, etc....but in a properly designed system they really do help. I have had them in most of my systems. If they had no use, why would all competition vehicles use them? Aside from competition vehicles, my friend had a decent system in his car, with just marginal wiring. The headlights would dim like crazy...he installed a cap, and it eliminated about 75% of the dimming. Wasn't a bad fix for less than $100. Just ask Richard Clark about capacitors use in car audio. He introduced them into car audio back in the day and trademarked the term "stiffening capacitor". They also filter noise if present in the power cables.
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