nostromo wrote:
To make sense of the battery question, consider that the batteries have an internal resistance that needs to be figured in to the equations, this is why the AAA 12v cannot deliver the current of the car battery, they have a much higher internal resistance, measure the voltage drop across a car battery when you are cranking the engine and if you know the current drawn there is your car battery figure.
Now hook your AAA array up to the battery terminals and try and start the car, measure the voltage at the terminals, I'm guessing but it will probably be 0.5v or something..again if you know the current being delivered (you could safely insert a multimeter) you can establish the internal resistance of the AAA array cells, which to complicate things may even change when current is drawn, still ohms law will not lie.
Looking at my 'AA' Nickle Metal Hydride cells, they show 1600 Mah or 1.6 amps per hour.
Say, if the resistance was the same (all things being equal), it would take 5000 AA batteries to make 1000 amps/Hr, as in my truck battery.
625 batteries makes a 1000 amps at 1.25 volts, so you'd need 10 columns(
batteries) of 625 batteries in series, to generate 12.5 volts.
I wonder: How big is a block of 5000 AA batteries?
12 Jan 2012, 5:02 am
